use heroku button to deploy alerta
add heroku button to README
use free tier mongolab
add Procfile
use same gunicorn cmd line as docker
add gunicorn to requirements
Revert "use same gunicorn cmd line as docker"

This reverts commit aabefa3092a75a8ec6bfc301b8c4ddbda79a4b06.
load by module
add alerta client package to requirements
comment out logging
only create indexes on replicasets
get dynamic mongo db name