add flask-heroku dependency
attempt Heroku integration
try alternative config method
add comment
infer port from  if present
integrate alembic
DRY alembic config
try to make cli not require an alembic.ini on heroku
configure alembic dynamically for Heroku
update gitignore
move Heroku docs to docs dir
update instruction to reflect auto-detection of Heroku
only use Heroku environment if environment variable is present
manual merge (requirements.txt got confused)
Merge pull request #417 from mk270/feature/heroku-integration

Feature/heroku integration