fix closeQuery to only close itself

this.query.off(); called with no parameters closes all Firebase listeners at that location. It should instead be called with the original eventType, callback and context passed in.

Author: jshortall

firebase-element.html

@@ -341,7 +341,10 @@ <h3>My Firebase Data</h3>
     },
     closeQuery: function() {
       if (this.query) {
-        this.query.off();
+        this.query.off('child_added', this.childAdded, this);
+        this.query.off('child_changed', this.childChanged, this);
+        this.query.off('child_moved', this.childMoved, this);
+        this.query.off('child_removed', this.childRemoved, this);
       }
     },
     //