fix(carousel): correct glyphicon

Fixes #2006
Closes #2014

Author: tomchentw

template/carousel/carousel.html

@@ -3,6 +3,6 @@
         <li ng-repeat="slide in slides track by $index" ng-class="{active: isActive(slide)}" ng-click="select(slide)"></li>
     </ol>
     <div class="carousel-inner" ng-transclude></div>
-    <a class="left carousel-control" ng-click="prev()" ng-show="slides.length > 1"><span class="icon-prev"></span></a>
-    <a class="right carousel-control" ng-click="next()" ng-show="slides.length > 1"><span class="icon-next"></span></a>
+    <a class="left carousel-control" ng-click="prev()" ng-show="slides.length > 1"><span class="glyphicon glyphicon-chevron-left"></span></a>
+    <a class="right carousel-control" ng-click="next()" ng-show="slides.length > 1"><span class="glyphicon glyphicon-chevron-right"></span></a>
 </div>