GUACAMOLE-5: Use contextual actions to add connections and connection groups.

guacamole/src/main/webapp/app/manage/controllers/manageConnectionController.js

@@ -291,7 +291,10 @@ angular.module('manage').controller('manageConnectionController', ['$scope', '$i
 
     // If we are creating a new connection, populate skeleton connection data
     else {
-        $scope.connection = new Connection({ protocol: 'vnc' });
+        $scope.connection = new Connection({
+            protocol         : 'vnc',
+            parentIdentifier : $location.search().parent
+        });
         $scope.historyEntryWrappers = [];
         $scope.parameters = {};
     }

guacamole/src/main/webapp/app/manage/controllers/manageConnectionGroupController.js

@@ -175,7 +175,9 @@ angular.module('manage').controller('manageConnectionGroupController', ['$scope'
 
     // If we are creating a new connection group, populate skeleton connection group data
     else
-        $scope.connectionGroup = new ConnectionGroup();
+        $scope.connectionGroup = new ConnectionGroup({
+            parentIdentifier : $location.search().parent
+        });
 
     /**
      * Available connection group types, as translation string / internal value