Add Rails 4 as a permitted dependency.  Add Rails 4 to the test matrix.  Remove Ruby 1.8.x from test matrix because specs were failing anyway because of capybara dependency.  Add JRuby to the test matrix and neaten up the JRuby dependencies.
Merge pull request #115 from petergoldstein/feature/rails_4_and_travis

Travis Ci Update - Rails 4, Ruby 2.0, JRuby