Reorganized everything to fit the new sbt template.

I refactored everything to conform with this [template](https://github.com/lorandszakacs/config/tree/master/sbt/aggregate-project-template)

Still have to extract the following subprojects from sg-downloader:
* util-io
* util-html
* util-http
Removed redundant tests.
Renamed the packages to start with me.lorandszakacs.
Refactoring ahead! Split project into subprojects.