minfoprovider: Response-received signal updated

minfoprovider: Response-received signal updated

* The signal notifying for response-received now returns an array
of object paths.
* The TMDBMovie service objects are updated so that they get an ID
to tell between each other.
* The TODO file is updated to reflect the progress

WARNING: Currently, the ID the movie service objects are receiving
starts with 0 in each call to query, which causes conflicts once
that a query is done:
- A method to generate UID must be added
- The result objects lifetime must be controlled and finalized
when not needed.