Enable pushToTalk.js controller module.

scripts/system/controllers/controllerDispatcher.js

@@ -58,6 +58,7 @@ Script.include("/~/system/libraries/controllerDispatcherUtils.js");
         // not set to false (not in use), a module cannot start.  When a module is using a slot, that module's name
         // is stored as the value, rather than false.
         this.activitySlots = {
+            head: false,
             leftHand: false,
             rightHand: false,
             rightHandTrigger: false,

scripts/system/controllers/controllerScripts.js

@@ -33,7 +33,8 @@ var CONTOLLER_SCRIPTS = [
     "controllerModules/nearGrabHyperLinkEntity.js",
     "controllerModules/nearTabletHighlight.js",
     "controllerModules/nearGrabEntity.js",
-    "controllerModules/farGrabEntity.js"
+    "controllerModules/farGrabEntity.js",
+    "controllerModules/pushToTalk.js"
 ];
 
 var DEBUG_MENU_ITEM = "Debug defaultScripts.js";