Capability to deploy the movie database to Heroku

As discussed: I added support for a Heroku deployment and also set the minimum Java version in the pom.xml to version 6 (made possible by your previous commits). Had to set the Java version to 7 though for the Heroku deployment :frowning:.

By the way, it is [already deployed](http://movie-database.herokuapp.com/movies), but it does not yet reset itself automatically as you have to add billing information in order to use the Heroku Scheduler plug-in. Need to figure out another way. Do you got any ideas?