Fixed the overflow of the url when adding an admin user or a team
member.
Merge pull request #57 from yosssi/fix-alert-layout-adding-user

Fixed the overflow of the url when adding an admin user or a team member.
Added GitHubApiUrl and GitHubDomain to settings and template
Put values from settings into handler/auth.go
Use custom github domain for webhook
Update all github clients in code
Added settings to github_add page (fix redirect)
Fixed identation
Make IsGit check less strict
Fixed another github client instance in code