convert wechaty-bro.js to plain old javascript syntax #60

[cherry-geqi]

When npm start with DEFAULT_HEAD set to "phantomjs", it throws WARN PuppetWebBrowser execute() exception: {"errorMessage":"Unexpected token ','","request"....

After debugging for hours I found that phantomjs, even the latest version, does not know es6 syntax such as arrow function.

Converting to es5 using babeljs.io online tool solves this problem.

[coveralls]

Coverage remained the same at 54.25% when pulling 1bdc761 on cherry-geqi:master into fc8d833 on wechaty:master.

[huan]

Thanks for the contribution!

Could you please keep the original coding style in your Pull Request? Because your PR include too many unrelated code changes.

I use the following styles when developing Wechaty:

1. comma style first.

   const a = [
       1
     , 2
   ]

2. semi: never

   const n = 3

3. align use spaces

     , confFactory:    confFactory
     , contactFactory: contactFactory

After you fixed that, I'm very happy to accept this PR.

Appreciate.

[coveralls]

Coverage increased (+0.04%) to 54.292% when pulling d46f6d9 on cherry-geqi:master into fc8d833 on wechaty:master.

[huan]

Thanks! Coverage also increased, amazing! ;-]