updating EPEL link
Merge pull request #10 from lzap/epel-fix

The old version is no longer working.
Fix comments from PR 7
Merge pull request #8 from GregSutcliffe/master

Fixes for @ohadlevy's comments in #7 / fix matching of operating system, so EPEL isn't installed on Fedora
Add optional puppetlabs debian repo via host param
Support overriding installation disk as well as defaulting to the most common ones
Work around testing nil==something in safemode
updates fedora/rhel/centos templates to remove various deprected kickstart command options