Add test for multiline argument rule
Comment when config is invalid
Rename PullRequest#add_comment to be more specific

* Rename PullRequest#add_comment to PullRequest#comment_on_violation
Rename GithubApi#add_comment to be more specific

* Rename GithubApi#add_comment to GithubApi#add_pull_request_comment
Suppot commenting on issues
Call and stub new methods
Minor improvements
WIP
Remove debugger
Improve RepoConfig
Fix failing tests
Update spec