Standerdize sizing of .btn-group and .input-group

Created by: Yahasana

current implement

<div class="btn-group">    <!-- add btn-sm for every buttons -->
    <button type="button" class="btn btn-default btn-sm">Left</button>
    <button type="button" class="btn btn-default btn-sm">Middle</button>
    <button type="button" class="btn btn-default btn-sm">Right</button>
</div>
<div class="input-group">    <!-- add input-sm for every inputs -->
  <input type="text" class="form-control input-sm">
  <span class="input-group-addon input-sm">.00</span>
</div>

vs

<div class="btn-group btn-sm">  <!-- only one btn-sm required -->
    <button type="button" class="btn btn-default">Left</button>
    <button type="button" class="btn btn-default">Middle</button>
    <button type="button" class="btn btn-default">Right</button>
</div>
<div class="input-group input-sm">  <!-- only one input-sm required -->
  <input type="text" class="form-control">
  <span class="input-group-addon">.00</span>
</div>

ref #9056