Unify all the repositories

Unifies all the 3 current repositories in a single repo.

QiiTa-ware was empty - I used it to create the single repo structure before porting it.
QiiTa-pet: the only important thing that it had was the HMP2 demo, which has been ported under the prototypes folder - all the extra code that @squirrelo and I developed has to be refactored so no need to port here.
QiiTa: it had the mongodb prototype, which is still located under the prototypes folder

The QiiTa-db API should be complete while the QiiTa-ware API is still not finished, but I think it is useful to merge and we can all start working on different parts of the code, as well as start adding issues for the needed functionality and/or any additions/modifications to the APIs.