Also specify separate project factory for project with filled repo

Add Repository model to proxy request to Gitlab::Git::Repositoty and decorate commits with Commit model

Use existing methods for branch names: Ex use @repository.branch_names instead of @repository.heads.map(&:name)

This reverts commit 4524ba20.

ProtectedBranches model, Master permission for repo\n Allow push to protected branch for masters only

Project activities perfomance increased. Cache for project activitites disabled. Repository conception changed