add app.json & deploy button
change heroku-postgres to use hobby-dev
Merge pull request #13 from bowerman/heroku-button

change heroku-postgres to use hobby-dev
Add UNICORN_WORKERS env var
:lipstick: use svg icon
add bowerman to collaborators
add deploy button to homepage
Merge pull request #12 from devfu/heroku-button

add app.json & deploy button
Update README

- Add mysql to Prerequisites
Merge pull request #14 from koedbymonkey/readme

Update README
ruby 2.1.2 -> 2.1.3