updates: Gemfiles, adds Rails4, Ruby2, Rspec3, Spree 2.3
updates: Rake file and lib to follow Spree 2.3 convensions
updates: assets, adds new files and folders to follow spree 2.3 convensions
removes: unecssary base_decorator in the model for search
adds new base decorator for spree search
adds: new rails_helper to install rspec3, updates: spec_helper for rspec3
updates: new support file for search
updates: all specs to make sure everything is green