Add ability to setup repo with env

[marocchino]

I should use github_token since I can not use ssh key in my deployment env.
Also, I can not write in _config.yml because it is public repo.

So, I make this PR. :3

[coveralls]

Coverage increased (+0.3%) to 87.64% when pulling dc393be on marocchino:env-repo into 498f637 on hexojs:master.

[Xuanwo]

Please let jscs happly, https://travis-ci.org/hexojs/hexo-deployer-git/jobs/158928547#L506-L523

[coveralls]

Coverage increased (+0.2%) to 88.235% when pulling 373575a on marocchino:env-repo into b4ec757 on hexojs:master.

[marocchino]

Oops. sorry @Xuanwo I fixed it.

[Xuanwo]

LGTM

[JackuB]

Is this feature released on npm? Tried to use it today, but had no luck. It was merged after current 0.2.0 that's on npm.

[NoahDragon]

@JackuB You could modify the package.json to set:

"hexo-deployer-git": "hexojs/hexo-deployer-git"

Then run npm install, it will get the latest development version.

[JackuB]

@NoahDragon yeah, but that kind of misses the point of versioning/package system. Switching to something like https://github.com/semantic-release/semantic-release can automate release process - I can prepare a PR with semrel if maintainer is interested.