Clean up Depdencies

This cleans up the dependencies a little bit (Berksfile and metadata). It just removes some unnecessary redundancy. I also updated the Vagrantfile to reduce duplicate code and added a new box to test the source install. 

This should include the fix reported in #162 and also some of the other refactoring from #146

I tested lucid32, lucid64 and centos6_32 with no errors. Let me know if I missed anything or we need to tweak anything.