fix animated/striped gradients in progress bars

docs/assets/css/bootstrap.css

@@ -3127,7 +3127,7 @@ a.thumbnail:hover {
   -o-transition: width 0.6s ease;
   transition: width 0.6s ease;
 }
-.progress.striped .bar {
+.progress-striped .bar {
   background-color: #62c462;
   background-image: -webkit-gradient(linear, 0 100%, 100% 0, color-stop(0.25, rgba(255, 255, 255, 0.15)), color-stop(0.25, transparent), color-stop(0.5, transparent), color-stop(0.5, rgba(255, 255, 255, 0.15)), color-stop(0.75, rgba(255, 255, 255, 0.15)), color-stop(0.75, transparent), to(transparent));
   background-image: -webkit-linear-gradient(-45deg, rgba(255, 255, 255, 0.15) 25%, transparent 25%, transparent 50%, rgba(255, 255, 255, 0.15) 50%, rgba(255, 255, 255, 0.15) 75%, transparent 75%, transparent);

less/progress-bars.less

@@ -53,7 +53,7 @@
 }
 
 // Striped bars
-.progress.striped .bar {
+.progress-striped .bar {
   #gradient > .striped(#62c462);
   .background-size(40px 40px);
 }