Refactor script/server

* Made style consistent
* Add helper functions to print messages
* Abort script if critical command fails
* Made number of started Sidekiq workers configurable again
bump safe_yaml
bump omniauth-twitter
bump client_side_validations
bump faraday
bump rspec-mocks
bump selenium-webdriver
bump haml
bump omniauth
bump foreigner
bump cucumber
bump fog
bump hike
bump subexec
bump uglifier
bump nested_form
bump pg
bump gon
bump configurate
bump rails_admin