Merge pull request #7 from toannguyenle/toan

fix merge conflicts
added heroku gem to gemfile
Merge pull request #8 from toannguyenle/steve_heroku

added heroku gem to gemfile
add .env to .gitignore
use unicorn via procfile
Merge pull request #9 from toannguyenle/read_me

Heroku update with unicorn via procfile
update app.js to avoid minification error