rewrite striped and active to deprecate the parent selectors, change the docs

dist/css/bootstrap.css

@@ -4718,14 +4718,16 @@ a.thumbnail.active {
        -o-transition: width .6s ease;
           transition: width .6s ease;
 }
-.progress-striped .progress-bar {
+.progress-striped .progress-bar,
+.progress-bar-striped {
   background-image: -webkit-linear-gradient(45deg, rgba(255, 255, 255, .15) 25%, transparent 25%, transparent 50%, rgba(255, 255, 255, .15) 50%, rgba(255, 255, 255, .15) 75%, transparent 75%, transparent);
   background-image:      -o-linear-gradient(45deg, rgba(255, 255, 255, .15) 25%, transparent 25%, transparent 50%, rgba(255, 255, 255, .15) 50%, rgba(255, 255, 255, .15) 75%, transparent 75%, transparent);
   background-image:         linear-gradient(45deg, rgba(255, 255, 255, .15) 25%, transparent 25%, transparent 50%, rgba(255, 255, 255, .15) 50%, rgba(255, 255, 255, .15) 75%, transparent 75%, transparent);
   -webkit-background-size: 40px 40px;
           background-size: 40px 40px;
 }
-.progress.active .progress-bar {
+.progress.active .progress-bar,
+.progress-bar.active {
   -webkit-animation: progress-bar-stripes 2s linear infinite;
        -o-animation: progress-bar-stripes 2s linear infinite;
           animation: progress-bar-stripes 2s linear infinite;

docs/_includes/components/progress-bars.html

@@ -120,60 +120,60 @@
   <h3 id="progress-striped">Striped</h3>
   <p>Uses a gradient to create a striped effect. Not available in IE8.</p>
   <div class="bs-example">
-    <div class="progress progress-striped" >
-      <div class="progress-bar progress-bar-success" role="progressbar" aria-valuenow="40" aria-valuemin="0" aria-valuemax="100" style="width: 40%">
+    <div class="progress">
+      <div class="progress-bar progress-bar-success progress-bar-striped" role="progressbar" aria-valuenow="40" aria-valuemin="0" aria-valuemax="100" style="width: 40%">
         <span class="sr-only">40% Complete (success)</span>
       </div>
     </div>
-    <div class="progress progress-striped">
-      <div class="progress-bar progress-bar-info" role="progressbar" aria-valuenow="20" aria-valuemin="0" aria-valuemax="100" style="width: 20%">
+    <div class="progress">
+      <div class="progress-bar progress-bar-info progress-bar-striped" role="progressbar" aria-valuenow="20" aria-valuemin="0" aria-valuemax="100" style="width: 20%">
         <span class="sr-only">20% Complete</span>
       </div>
     </div>
-    <div class="progress progress-striped">
-      <div class="progress-bar progress-bar-warning" role="progressbar" aria-valuenow="60" aria-valuemin="0" aria-valuemax="100" style="width: 60%">
+    <div class="progress">
+      <div class="progress-bar progress-bar-warning progress-bar-striped" role="progressbar" aria-valuenow="60" aria-valuemin="0" aria-valuemax="100" style="width: 60%">
         <span class="sr-only">60% Complete (warning)</span>
       </div>
     </div>
-    <div class="progress progress-striped">
-      <div class="progress-bar progress-bar-danger" role="progressbar" aria-valuenow="80" aria-valuemin="0" aria-valuemax="100" style="width: 80%">
+    <div class="progress">
+      <div class="progress-bar progress-bar-danger progress-bar-striped" role="progressbar" aria-valuenow="80" aria-valuemin="0" aria-valuemax="100" style="width: 80%">
         <span class="sr-only">80% Complete (danger)</span>
       </div>
     </div>
   </div>
 {% highlight html %}
-<div class="progress progress-striped">
-  <div class="progress-bar progress-bar-success" role="progressbar" aria-valuenow="40" aria-valuemin="0" aria-valuemax="100" style="width: 40%">
+<div class="progress">
+  <div class="progress-bar progress-bar-success progress-bar-striped" role="progressbar" aria-valuenow="40" aria-valuemin="0" aria-valuemax="100" style="width: 40%">
     <span class="sr-only">40% Complete (success)</span>
   </div>
 </div>
-<div class="progress progress-striped">
-  <div class="progress-bar progress-bar-info" role="progressbar" aria-valuenow="20" aria-valuemin="0" aria-valuemax="100" style="width: 20%">
+<div class="progress">
+  <div class="progress-bar progress-bar-info progress-bar-striped" role="progressbar" aria-valuenow="20" aria-valuemin="0" aria-valuemax="100" style="width: 20%">
     <span class="sr-only">20% Complete</span>
   </div>
 </div>
-<div class="progress progress-striped">
-  <div class="progress-bar progress-bar-warning" role="progressbar" aria-valuenow="60" aria-valuemin="0" aria-valuemax="100" style="width: 60%">
+<div class="progress">
+  <div class="progress-bar progress-bar-warning progress-bar-striped" role="progressbar" aria-valuenow="60" aria-valuemin="0" aria-valuemax="100" style="width: 60%">
     <span class="sr-only">60% Complete (warning)</span>
   </div>
 </div>
-<div class="progress progress-striped">
-  <div class="progress-bar progress-bar-danger" role="progressbar" aria-valuenow="80" aria-valuemin="0" aria-valuemax="100" style="width: 80%">
+<div class="progress">
+  <div class="progress-bar progress-bar-danger progress-bar-striped" role="progressbar" aria-valuenow="80" aria-valuemin="0" aria-valuemax="100" style="width: 80%">
     <span class="sr-only">80% Complete (danger)</span>
   </div>
 </div>
 {% endhighlight %}
 
   <h3 id="progress-animated">Animated</h3>
-  <p>Add <code>.active</code> to <code>.progress-striped</code> to animate the stripes right to left. Not available in IE9 and below.</p>
+  <p>Add <code>.active</code> to <code>.progress-bar-striped</code> to animate the stripes right to left. Not available in IE9 and below.</p>
   <div class="bs-example">
-    <div class="progress progress-striped active">
-      <div class="progress-bar" role="progressbar" aria-valuenow="45" aria-valuemin="0" aria-valuemax="100" style="width: 45%"><span class="sr-only">45% Complete</span></div>
+    <div class="progress">
+      <div class="progress-bar progress-bar-striped active" role="progressbar" aria-valuenow="45" aria-valuemin="0" aria-valuemax="100" style="width: 45%"><span class="sr-only">45% Complete</span></div>
     </div>
   </div>
 {% highlight html %}
-<div class="progress progress-striped active">
-  <div class="progress-bar"  role="progressbar" aria-valuenow="45" aria-valuemin="0" aria-valuemax="100" style="width: 45%">
+<div class="progress">
+  <div class="progress-bar progress-bar-striped active"  role="progressbar" aria-valuenow="45" aria-valuemin="0" aria-valuemax="100" style="width: 45%">
     <span class="sr-only">45% Complete</span>
   </div>
 </div>
@@ -186,7 +186,7 @@
       <div class="progress-bar progress-bar-success" style="width: 35%">
         <span class="sr-only">35% Complete (success)</span>
       </div>
-      <div class="progress-bar progress-bar-warning" style="width: 20%">
+      <div class="progress-bar progress-bar-warning progress-bar-striped" style="width: 20%">
         <span class="sr-only">20% Complete (warning)</span>
       </div>
       <div class="progress-bar progress-bar-danger" style="width: 10%">
@@ -199,7 +199,7 @@
   <div class="progress-bar progress-bar-success" style="width: 35%">
     <span class="sr-only">35% Complete (success)</span>
   </div>
-  <div class="progress-bar progress-bar-warning" style="width: 20%">
+  <div class="progress-bar progress-bar-warning progress-bar-striped" style="width: 20%">
     <span class="sr-only">20% Complete (warning)</span>
   </div>
   <div class="progress-bar progress-bar-danger" style="width: 10%">

less/mixins/progress-bar.less

@@ -2,6 +2,8 @@
 
 .progress-bar-variant(@color) {
   background-color: @color;
+
+  // Depcreated parent class requirement as of v3.2
   .progress-striped & {
     #gradient > .striped();
   }

less/progress-bars.less

@@ -41,6 +41,10 @@
 }
 
 // Striped bars
+//
+// `.progress-striped .progress-bar` is deprecated as of v3.2 in favor of the
+// `.progress-bar-striped` class, which you just add to an existing
+// `.progress-bar`.
 .progress-striped .progress-bar,
 .progress-bar-striped {
   #gradient > .striped();
@@ -48,7 +52,11 @@
 }
 
 // Call animation for the active one
-.progress.active .progress-bar {
+//
+// `.progress.active .progress-bar` is deprecated as of v3.2 in favor of the
+// `.progress-bar.active` approach.
+.progress.active .progress-bar,
+.progress-bar.active {
   .animation(progress-bar-stripes 2s linear infinite);
 }