resolves #138: git-pr

@kevgo @allewun 
Don't indent this comment line without having a reason to do so. 

```ruby
# Returns the remote URL for a new pull request for the given domain and branch
# 
# Parameters:
# domain: "Github" or "Bitbucket"
# branch_name: the name of the branch to merge in the PR
```

I think you could also just remove this line. Or add this description to all methods that take this parameter.