No trample/mangle on inline text links when using GitHub references (text is replaced)
For example,
```md
[A github issue](https://github.com/gitterHQ/gitter/issues/1)
```
should return the text "A github issue" but instead is returns a decorated issue link, `gitterHQ/gitter#1`
## Workaround
Just add a slash onto the end of the GitHub URL:
```md
[A github issue](https://github.com/gitterHQ/gitter/issues/1/)
```
issue