Updated gems: aws-sdk 1.47.0 -> 1.48.1 and nokogiri 1.6.2.1 -> 1.6.3.1
Updated cancancan 1.8.4 -> 1.9.1
Updated devise_invitable gem 1.3.5 -> 1.3.6
Updated rest-client gem 1.7.1 -> 1.7.2
Updated uglifier gem 2.5.1 -> 2.5.3
Updated rspec-rails gem 3.0.1 -> 3.0.2