Overlord2/mabdeljalil Version 1

create utility helper methods to dry up your Given steps. the body of this method could be replaced with a single call to a `create_bomb(activation_code, deactivation_code)` helper. 

additionally, because this is a Given/background setup step (and its end goal is to just provide a bomb object to be tested in the next steps), you could also use `factory_girl` to build the bomb object instead of going through the actual `visit`/`fill_in`/`click_button` steps.