adding Unicorn gem and config file
add .env to .gitignore
removed .txt from Procfile name
Merge pull request #82 from tarynsauer/herokuFix

Heroku fix - Unicorn was not activated in the Gemfile under the production group; No unicorn config file; Procfile was misnamed: no .txt suffix needed

I don't always submit pull requests.... but when I do, I merge my own.