upgrade to hydra 6.2 and Rails 4.1

remove deprecation warnings. Helpers removed are stripped from blacklight 5.0
Merge pull request #211 from pulibrary/hydra_6_2

upgrade to hydra 6.2 and Rails 4.1
Merge pull request #212 from pulibrary/development

Update Master to Hydra 6.2 / Rails 4.1