Updating dependencies

* Updating friendly_id to v5.0.2
* Updating geocoder to v1.1.9
* Updating sidekiq to v2.17.1
* Updating uglifier to v2.3.3
* Updating nokogiri to v1.6.1
* Updating guard related gems
* Updating capybara to v2.2.0 and poltergeist to v1.5.0
* Updating webmock to v1.16.1
* Updating rabl to v0.9.3