Update foreigner dependency to version 1.4.2
Update haml dependency to version 4.0.3
Update database_cleaner dependency to version 1.0.1
Update spring dependency to version 0.0.10
Update guard dependency to version 1.8.1
Update guard-rspec dependency to version 3.0.2
Update rspec-rails dependency to version 2.14.0
Update shoulda-matchers dependency to version 2.2.0
Modify rspec config
Remove option 'cli' in Guardfile