Repository importing and mirroring #21

These two features should support the following VCS: Git, Subversion and Mercurial

• Importing of repositories into a new Git repository on GitArena
• Mirroring of existing repositories into a new Git repository on GitArena (with frequent updates at configurable intervall)

For the later case, it is important to know how GitArena should handle conflicts (such as when code is changed on GitArena and then conflicts with a change that was pushed to the mirror). The following two solutions come to my mind:

• Make code in mirrored repositories read-only (but not issues etc.)
• Stop mirroring changes as soon as code has been pushed to the GitArena repository manually

I'm happy to discuss this and I'm open for suggestions.