Minor changes to installation and databases docs.

Change .gitignore to ignore logrotated log files.

Add option to disable username changing

Ssh fingerprint fix

Fix link to owner of group and team in admin interface

Fix gitlab:setup task on fresh installation

Fix file_name for archive

fixed API access to the project

Added creation of pids directory to fix #2995, replaced deprecated nginx init.d command with service one, some more clean-up

Remove hardcoded refernce to gitlab-shell home. so that gitlab can be installed on any unix account other than git

OS X support for gitlab:check rake tasks