updating rails in epel to 4.x

I've done some investigation as to updating rails in EPEL to the latest release (4.2.1). As part of this I've been refactoring polisher [1] and have written a few new utilities to cross reference upstream / downstream dependencies and output the results in in a tree like manner [2][3] as well as to highlight upstream dependencies missing downstream [4]. The results of the last utility run [5] should give a rough estimate of the work entailed. Dev deps have been included for this run so many updates are duplicate / unecessary. I'll look into consolidating this list and taking some of the simpler updates in the near future, obviously the more eyeballs that we get on this, the quicker it will go. -Mo [1] https://github.com/ManageIQ/polisher [2] https://github.com/ManageIQ/polisher/blob/master/bin/gem_mapper.rb [3] https://mmorsi.fedorapeople.org/gem_mapper.png [4] https://github.com/ManageIQ/polisher/blob/master/bin/missing_deps.rb [5] https://mmorsi.fedorapeople.org/missing_deps_output