fixes #2818 - validation of OS families in ptables
fixes #3239 - pxelinux spoofing on postgres now works
Fixes #3293 add FactoryGirl to tests
fixes #2895 - apply updates to environments on puppet class import
fixes #3369 - pin rubyzip to < 1.0.0 for Ruby 1.8
fixes #3138 - removing rbvmomi require statement

And implementing auto determining of available providers. Plus adding new
tab in the About page that shows available providers.