implemented integration test for reset pwd

Also - fixed spec host error by adding
config.action_mailer.default_url_options = { host: 'localhost:3000'} to
config/environ/test file
Not done invitations

Will do invitations when needed in real world app. For now, dont need
invitations in that.
added mailer production
added email pwd to production
added mail gun accnt details
added host production
added sidekiq
Added unicorn, procfile, foreman.
Paratrooper implemented
Merge pull request #12 from arjunrajkumar/week5

Week5