[Common UI] Initial commonUI bundles

Bring in work on general-purpose and over-arching
user interface bundles from the sandbox transition
branch. WTD-574.

platform/commonUI/general/res/templates/containers/accordion.html

@@ -0,0 +1,10 @@
+<div class="accordion" ng-controller="AccordionController as accordion">
+    <div class="accordion-head" ng-click="accordion.toggle()">
+        {{container.title}}
+    </div>
+    <div class="accordion-contents"
+         ng-show="accordion.expanded()"
+         style="height: 180px;"
+         ng-transclude>
+    </div>
+</div>