Merge pull request #43 from openshift/online

Merge pull request #42 from openshift/master
Extract DocSiteBuilder::Helpers#distro_map into _distro_map.yml file.
Merge pull request #44 from Fryguy/extract_distros_into_yaml

Extract DocSiteBuilder::Helpers#distro_map into _distro_map.yml file.
Updated the docs.openshift.com landing page
Merge pull request #46 from CowboysFan/docs_landing_page

Updated the docs.openshift.com landing page
Removed Contributing topic from welcome page; fixed headings
Merge pull request #47 from CowboysFan/fix_welcome_page

Fix welcome page
Merge pull request #48 from openshift/master

Merge changes from master to online branch