[WIP] Major refactoring

[andreamattavelli]

This pull request attempts to better organize the code and automatize the build of SUSHI.

Some comments:

1. I've incorporated the code of sushi and sushi-lib. They are now referred to as master and runtime.
2. I've also incorporated JBSE as git submodule, since SUSHI is closely linked to it.
3. I've created a Maven pom.xml to build the projects.

This PR depends on pietrobraione/jbse#8

[pietrobraione]

OK for the general idea, but I would like not to lose the history of the sushi-lib project, so I would leave it in its own repository and incorporate it as a submodule.

[andreamattavelli]

@pietrobraione Done.
This PR now depends on pietrobraione/sushi-lib#2 and cannot be merged until then.

[pietrobraione]

Reckon you should bump sushi-lib version before merging...

[andreamattavelli]

Reckon you should bump sushi-lib version before merging...

Absolutely, otherwise the build will fail since sushi-lib does not have Maven support.
Another point to solve before merging IMHO is pietrobraione/jbse#10. Otherwise mvn package will fail.

[pietrobraione]

Ack.