Fixing bug that caused references to stale DOM objects to be kept and used by Panels service

Was causing panels to break when used in conjuction with ng-repeat + filters

app/assets/javascripts/admin/index_utils/services/panels.js.coffee

@@ -1,14 +1,16 @@
 angular.module("admin.indexUtils").factory 'Panels', ->
   new class Panels
-    panels: []
+    all: []
 
     register: (ctrl, object, selected=null) ->
       if ctrl? && object?
-        @panels.push { ctrl: ctrl, object: object, selected: selected }
+        existing = @panelFor(object)
+        newPanel = { ctrl: ctrl, object: object, selected: selected }
+        if existing then angular.extend(existing, newPanel) else @all.push(newPanel)
         ctrl.select(selected) if selected?
 
     toggle: (object, name, state=null) ->
-      panel = @findPanelByObject(object)
+      panel = @panelFor(object)
       if panel.selected == name
         @select(panel, null) unless state == "open"
       else
@@ -18,5 +20,5 @@ angular.module("admin.indexUtils").factory 'Panels', ->
       panel.selected = name
       panel.ctrl.select(name)
 
-    findPanelByObject: (object) ->
-      (panel for panel in @panels when panel.object == object)[0]
+    panelFor: (object) ->
+      (@all.filter (panel) -> panel.object == object)[0]