Initial commit of centos modifications

typo fixed
provisioning should work now - not tested yet

Comment added for RVM usage
Fix permissions
Several improvements, messing around with rvm, punch a hole into the strict iptables firewall to make the nginx accessible
Debugging settings, more heap for quikcer turnaround

Even more heapspace because the machine is swapping already

remove whitespaces
centos added as supported environment
Switch back to ubuntu as standard, comment in test CentOS box.
production tests successful with this configuration on ubuntu

Version dump
Remove destructive ruby purge command
added platform definitions

Typo corrected
Using the RVM cookbook of @fnichol works much better
Change test box,
commented in my development hacks,
restoring "DEVELOPMENT-MODE" state,
added rvm options
Code style
Several improvements, removal of debug and firewall code, make ipv6 possible for ubuntu, README updated
Merge branch 'rebase' of https://github.com/CoreMedia/gitlab-cookbook into CoreMedia-rebase
Merge branch 'CoreMedia-rebase'

Conflicts:
	Vagrantfile
	recipes/default.rb
	templates/default/nginx_gitlab.erb