Bug 1108871 - grunt was killing the ``visible`` attr in the html minification

changed it to ``numvisible`` and it works fine

ui/js/directives/main.js

@@ -191,11 +191,12 @@ treeherder.directive("thTruncatedList", [
         restrict: "E",
         scope: {
             // number of visible elements
-            visible: "@",
+            numvisible: "@",
             elem_list: "=elements"
         },
         link: function(scope, element, attrs){
-            scope.visible = parseInt(scope.visible)
+            scope.visible = parseInt(scope.numvisible)
+
             if(typeof scope.visible !== 'number'
                 || scope.visible < 0
                 || isNaN(scope.visible)){

ui/partials/main/thSheriffPanel.html

@@ -99,10 +99,10 @@
                 <tr ng-repeat="exclusion in exclusions">
                     <td>{{::exclusion.name}}</td>
                     <td>{{::exclusion.description}}</td>
-                    <td><th-truncated-list visible="2" elements="exclusion.info.repos" /></td>
-                    <td><th-truncated-list visible="2" elements="exclusion.info.platforms" /></td>
-                    <td><th-truncated-list visible="2" elements="exclusion.info.option_collections" /></td>
-                    <td><th-truncated-list visible="2" elements="exclusion.info.job_types" /></td>
+                    <td><th-truncated-list numvisible="2" elements="exclusion.info.repos" /></td>
+                    <td><th-truncated-list numvisible="2" elements="exclusion.info.platforms" /></td>
+                    <td><th-truncated-list numvisible="2" elements="exclusion.info.option_collections" /></td>
+                    <td><th-truncated-list numvisible="2" elements="exclusion.info.job_types" /></td>
                     <td>
                         <button ng-click="init_exclusion_update(exclusion)" type="button" class="btn btn-default btn-xs">
                           <span class="glyphicon glyphicon-pencil"></span> Change