Don't setuid the repositories on installation

Added methods to protect and unprotect branches in from the API

Merge branch 'extend_user_api' of https://github.com/bladealslayer/gitlabhq into bladealslayer-extend_user_api

Conflicts:
	spec/requests/api/users_spec.rb

Update config/database.yml.postgresql

Fix bug of network graph(#2847) and trivial code clean up.