Include name in unknown call warning (facebook#365)

This just makes it a little easier to debug.

Author: matthewwithanm

agent/Bridge.js

@@ -331,7 +331,7 @@ class Bridge {
 
  _handleCall(name: string, args: Array<any>, callback: number) {
  if (!this._callers[name]) {
- return console.warn('unknown call');
+ return console.warn('unknown call: "' + name + '"');
  }
  args = !Array.isArray(args) ? [args] : args;
  var result;