Resolve branch names with a dot included

For: https://github.com/raulb/node-js-sample/tree/2.1

**Before:**

![](http://cl.ly/image/0D091B03353E/content)

**Now:**

```
{
  "user": "raulb",
  "repo": "node-js-sample",
  "branch": "2.1",
  "tarball_url": "https://api.github.com/repos/raulb/node-js-sample/tarball/2.1",
  "https_url": "https://github.com/raulb/node-js-sample/tree/2.1",
  "travis_url": "https://travis-ci.org/raulb/node-js-sample?branch=2.1",
  "api_url": "https://api.github.com/repos/raulb/node-js-sample"
}
```