Change the page title when different things are being viewed

It's useful to have some information in the page title about what is
being viewed on that page. For example, the story title should be in
the page title for a story detail page.

See https://storyboard.openstack.org/#!/story/2000178.

Change-Id: If4f63e90a03ca92f3a92c11c27011233797eb4dd

src/app/admin/template/project_group.html

@@ -18,6 +18,7 @@
 
     <div class="row">
         <div class="col-xs-12">
+            <view-title>Project Group Admin</view-title>
             <button class="btn btn-primary btn-sm pull-bottom-right"
                     ng-click="addProjectGroup()">
                 <i class="fa fa-plus"></i>

src/app/admin/template/team.html

@@ -17,6 +17,7 @@
 <div class="container">
     <div class="row">
         <div class="col-xs-12">
+            <view-title>Teams</view-title>
             <h1><i class="fa fa-sb-team"></i> Teams</h1>
         </div>
     </div>

src/app/admin/template/user.html

@@ -18,6 +18,7 @@
 
     <div class="row">
         <div class="col-xs-12">
+            <view-title>Users</view-title>
             <button class="btn btn-primary btn-sm pull-bottom-right"
                     ng-click="addUser()">
                 <i class="fa fa-plus"></i>