improve test coverage of entire app
* separate attach image proof spec and make it pass
* create guard groups for rails/specs
* email is never blank
* specs for User.create_with_omniauth
* specs for user.name_and_email
* use 'rails' parameter for coverage
* adding note and invalid factory for proof
* proof model specs
* proofs controller spec
* removing role spec
* unused local variable
* added specs for requirements_helper
* make redcarpet_html_renderer method private
* rename requirements spec, adding whitespace
* whitespace