C2 mirna yacout c2 s2 connect to twitter

#181 

@AmrARaouf 
@Omar-Hossam 
@karimngr 
@Fattouh92 

files: authentications_controller + authentication.rb + tests > create & remove (auth) + tests for #90 and #81 + edit settings view (devise/regis/edit) + gemfile + routes