Add https only request header option

Adds optional RequestHeader X-Forwarded-Proto "https" for SSL only vhosts to prevent redirects to http:// urls
Fix whitespace
Update install/CentOS_6.md

Updated gitlab-centos script to 4-0-stable to fix unicorn and sidekiq startup errors.
Merge pull request #1 from diegotdai/patch-1

Update install/CentOS_6.md
Update init script status from Unicorn to Puma
Merge pull request #83 from sagikazarmark/patch-1

Update init script status from Unicorn to Puma
Merge pull request #61 from gefd/f-https-only-redirect

Fixes http redirects on https only vhost
Merge branch 'master' of https://github.com/gitlabhq/gitlab-recipes
Fixed the centos init.d script for use with puma.
First cut of the updated installation guid for Gitlab 5.1 on CentOS 6.3
Minor textual improvements
Minor cleanups of the CentOS_6 install guide
Updated the installation guide to Gitlab 5.2

Signed-off-by: Niels Basjes <github@basjes.nl>
Merge pull request #98 from nielsbasjes/CentOSGitlab51

Installing Gitlab 5.2 on CentOS 6.4
Do not duplicate files from the main repo.
Remove outdated scripts.
Merge pull request #103 from gitlabhq/unduplicate

Unduplicate
Initial commit of new structure
Add initial readme for Gentoo/Archlinux
Update general readme with instructions on Pull Requests