We migrated to GitHub

As mentioned here, we migrated the scm-manager core repository to GitHub: scm-manager/scm-manager.

We decided to do so due to the removed mercurial support from Bitbucket. This is no statement whatsoever against Mercurial, we will continue to support Mercurial, Git and Subversion.

• We migrated the entire code base from Mercurial to Git
• The Bitbucket Wiki is now located in the docs folder of the repository
• All issues have been migrated