Added spy panels to map and histogram, added editor toggle to enable/disable spy

panels/histogram/editor.html

@@ -44,4 +44,15 @@
     <label class="small">Time correction</label> 
     <select ng-change="$emit('render')" ng-model="panel.timezone" class='input-small' ng-options="f for f in ['browser','utc']"></select>
   </div>
-</div>
+</div>
+<h5>Panel Spy</h5>
+<div class="row-fluid">
+  <div class="span2"> 
+    <label class="small"> Spyable </label><input type="checkbox" ng-model="panel.spyable" ng-checked="panel.spyable">
+  </div>
+  <div class="span9 small">
+    The panel spy shows 'behind the scenes' information about a panel. It can
+    be accessed by clicking the <i class='icon-eye-open'></i> in the top right
+    of the panel.
+  </div>
+</div>