updated Gemfile to support Cells 4.0, Rails 4.2 and rspec 3.2
updated Gemfile to support Cells 4.0, Rails 4.2 and rspec 3.2

apotonick/rspec-cells,timoschilling/rspec-cells,apotonick/rspec-cells,timoschilling/rspec-cells,CJBrew/rspec-cells,PikachuEXE/rspec-cells,PikachuEXE/rspec-cells,CJBrew/rspec-cells