Update step 5 "database" (Issue #2894)

Made it a bit clearer what step 5 is for to stop people skipping it. This time with a relative link.

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.

Expose MergeRequest object as a notable in the API to allow for easy ret...

Displaying commit on a new window, when clicking commit on network graph.

Improve overlap of lines in network graph

Switchable the main branch on network graph