Upgrade to Rails 4.1.5 & Ruby 2.1.2

Rebundled all Gem dependencies and fixed issue with database seed file
Remove Sorcery activation feature
Change session form to use email instead of username

Caught this a while ago but forgot to update the form label & controller
param
Fix ActiveRecord error with conditions on included table
Upgrade rspec-rails & shoulda-matchers (all tests green)