There are two callbacks that could be used with Github integration:
* /import/github/callback (used by project import)
* /users/auth/github/callback (used by OmniAuth)
Github's documentation suggests that authorization callback url should be
set to the longest common path.
https://developer.github.com/v3/oauth/#redirect-urls
Configuring according to the previous documentation resulted in a
redirect_uri_mismatch error from Github when logging in via OmniAuth.
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.
Add GitHub OmniAuth docs
Google instructions
Google instructions
Merge master
Clean things up
Clean things up
Clean things up
Clean things up
Clean things up
Clean things up
Clean things up
Add Google and Twitter docs
Add screenshot
Add screenshot
Clean things up
Clean things up
Clean things up
Clean things up
Clean things up
Clean things up
Clean things up
Finalize current docs
Finalize current docs
Add existing user information
Add twitter
Add twitter
Add Twitter disclaimer
Add Twitter disclaimer
remove old doc
Remove unnecessary link
Revert omniauth provider format
Add OmniAuth Documentation
Add GitHub OmniAuth docs
Google instructions
Google instructions
Merge master
Clean things up
Clean things up
Clean things up
Clean things up
Clean things up
Clean things up
Clean things up
Add Google and Twitter docs
Add screenshot
Add screenshot
Clean things up
Clean things up
Clean things up
Clean things up
Clean things up
Clean things up
Clean things up
Finalize current docs
Finalize current docs
Add existing user information
Add twitter
Add twitter
Add Twitter disclaimer
Add Twitter disclaimer
remove old doc
Remove unnecessary link
Revert omniauth provider format
Use omniauth again
Remove notice
Restore whitespace
Slight changes