Gemfile in sw2at-ui-0.0.10 vs Gemfile in sw2at-ui-0.0.11

@@ -1,14 +1,15 @@
 source 'http://rubygems.org'
 
 gem 'rails', '>= 3.1'
 
-gem 'fire-model', '~> 0.0.17'
+gem 'fire-model', '~> 0.0.18'
 gem 'slim-rails'
 gem 'sass-rails'
 gem 'coffee-rails'
 gem 'bootstrap-sass'
 gem 'tarvit-helpers'
+gem 'time_difference'
 
 group :development do
   gem 'shoulda', '>= 0'
   gem 'rdoc', '~> 3.12'
   gem 'rspec', '~> 3.2'