removed sudo when installing ruby

In the documentation rvm is installed as user miqbuilder which is a local user and rvm gets installed to his profile. So to install ruby there is no need of sudo.
updated dev docs
match URL on the current_page instead of the current link

I think this fixes #178, but we'll have to see when it is deployed.
Merge pull request #141 from Ranjandas/patch-1

removed sudo when installing ruby - good to go.
blog post on depot repo
update dev docs
used a global session variable (ugh) to track the rendered page URL

(This works around a bug where page rendering is called within the
search index.)
Update the guide for the ruby 2.0 upgrade.
Provide rvm install instructions and a link to http://rvm.io/rvm/install

Provide example for development version of rvm.
Epel is optional.

Pass the url to the epel-release-6-8.noarch.rpm directly to yum.
Update link to fedoraproject instead of a mirror.