update gems

Updating following dependencies:

jquery-rails: 3.1.1 => 3.1.2
[Full Change](https://github.com/rails/jquery-rails/compare/v3.1.1...v3.1.2)

momentjs-rails: 2.8.1 => 2.8.3
[Full Change](https://github.com/derekprior/momentjs-rails/compare/v2.8.1...v2.8.3)

puma: 2.9.0 => 2.9.1
[Full Change](https://github.com/puma/puma/compare/v2.9.0...v2.9.1)

rails: 4.1.5 => 4.1.6
[Full Change](https://github.com/rails/rails/compare/v4.1.5...v4.1.6)

rails-i18n: 4.0.2 => 4.0.3
Not available 

rolify: 3.4.0 => 3.4.1
[Full Change](https://github.com/RolifyCommunity/rolify/compare/v3.4...v3.4.1)

rspec-rails: 3.0.2 => 3.1.0
[Full Change](https://github.com/rspec/rspec-rails/compare/v3.0.2...v3.1.0)

selenium-webdriver: 2.42.0 => 2.43.0
Not available