Fix logic on Fedora 20

We don't want epel on Fedora 20!
Add very basic TK env for testing
Include apt as a depend
Update to newer CentOS; Add Fedora 20; Include apt::default
Use opscode image instead
Use correct version logic for apt
Merge pull request #1 from osuosl-cookbooks/ramereth/fedora-20-fixes

Fedora 20 fixes