[firebase] get unique nodeID

[Costas]

			function getNewNodeKey(url) {
				var getNewKey4DB = new Firebase(url);
				var ret = "";

				$.when(getNewKey4DB.push().name()).done(function(x) {
					ret = x;
				});

				return ret;
			}

The id is unique across all paths; it doesn’t matter which path you request it for.</pre>