[Mobile] IN PROGRESS: General fixes, spurred by mobile, for object-header

open #74
Attempting to layout using flex - not working;
See http://jsfiddle.net/charlesh88/cpf9zjts/9/ for working example;
New _flex.scss added;
This commit is changed elements that are mostly solid;

platform/commonUI/browse/res/templates/browse-object.html

@@ -22,6 +22,7 @@
 <span ng-controller="BrowseObjectController">
     <div class="object-browse-bar bar abs">
         <div class="items-select left abs">
+            <mct-representation key="'back-arrow'"></mct-representation>
             <mct-representation key="'object-header'" mct-object="domainObject">
             </mct-representation>
         </div>