Fix Ctrl-c interruption bug in auth.rb

Make input in terminal visible after interruption in ask_for_password
Merge pull request #1095 from mtcomscxstart/auth-interruption-fix

Fix Ctrl-c interruption bug in auth.rb
sort
bring 2fa plugin in
3.7.0.pre
heroku-two-factor plugin deprecated
v3.7.0.pre2
Correctly parse app stack in both formats at creation
Merge pull request #1096 from heroku/app-creation-stack-fix

Correctly parse app stack in both formats at creation