This stands as an alternative to using OAuth to access a user's Github
repositories. This is setup in such a way that it can be used without OAuth
configuration.
From a UI perspective, the how to import modal has been replaced by a full
page, which includes a form for posting a personal access token back to the
Import::GithubController.
If the user has logged in via GitHub, skip the Personal Access Token and go
directly to Github for an access token via OAuth.
These changes were pulled from GitLab EE to support configuring
an alternative API URL than the default https://api.github.com.
In addition, the `verify_ssl` flag allows users to disable SSL cert
checking.
One modification: add a default `args` option if it does not exist
to avoid breaking existing configurations.
