Upgraded Rails to ~> 4.1.4
Merge pull request #1067 from duke-libraries/rails-41

Upgraded Rails to ~> 4.1.4
Upgraded hydra-head to version 7.2.0 (upgraded active-fedora to 7.1.0, blacklight to 5.5.3, etc.)
Upgraded rspec-rails to version 2.99.0
Upgraded capybara to version 2.4.1
Closes #1032
Closes #1031
Closes #885
Closes #888