Adds methods to doc and query that operate on ref data.

firebase-database-behavior.html

@@ -51,6 +51,17 @@
         '__onlineChanged(online)'
       ],
 
+      /**
+       * Remove all data at the current query location.
+       *
+       * **Note:** This will remove *all* data at the path of this
+       * query, regardless of whether it is visible given the current
+       * query parameters.
+       */
+      remove() {
+        return this.ref.remove();
+      },
+
       _setFirebaseValue: function(path, value) {
         this._log('Setting Firebase value at', path, 'to', value)
         var key = value && value.$key;

firebase-query.html

@@ -154,8 +154,34 @@
           this.__queryChanged(null, this.query);
         },
 
+        /**
+         * Returns the data of the child with the specified key.
+         *
+         * **Note:** Will return `null` for any child that is not
+         * matched **by the current query parameters**.
+         */
         child: function(key) {
-          return this.__map[key];
+          return this.__map[key] || null;
+        },
+
+        /**
+         * Push a new item onto the path of this query.
+         *
+         * **Note:** If the data pushed does not match current query
+         * parameters, it will not appear in `data`.
+         */
+        push(data) {
+          return this.ref.push(data);
+        },
+
+        /**
+         * Remove a child by its specified key.
+         *
+         * **Note:** The child matching the specified key will be
+         * removed whether or not it is visible in the current query.
+         */
+        removeChild(key) {
+          return this.ref.child(key).remove();
         },
 
         get isNew() {