add support for older git versions (1.7.x)

It always asks for git password, when using older git.( CentOS 6.x is installed git 1.7.1 :cry: )

In the following article, it says to use either `https://<token>@github.com/owner/repo.git` or `https://<token>:x-oauth-basic@github.com/owner/repo.git`.

https://github.com/blog/1270-easier-builds-and-deployments-using-git-over-https-and-oauth

If you add `x-oauth-basic`, will not be prompted for a password.