Revert "Add Dockerrun.aws.json"

This reverts commit 205e9f1dbf19c4342b13862f428298734a7d09fe.
Add a project Dockerfile for a public image
Add task for producing private version Dockerfiles
Add prepareImages helper to Build.scala
Remove docker directory
Get rid of Heroku stuff
Update sbt version
Update scala version
Fix tests
0.1.1