add service class hierarchy

replaced references to program class with references to service class.
corrected service objects declaration and registration

Corrected service objects declaration (mf decorators) and registration
so that they can be used from the dashboard. mobyle2.web part.
add new service objects to nf dashboard

New service object classes have been added, and their display is
customized.
Merge branch 'feature_servicemodel' into develop

Conflicts:
	mobyle/web/__init__.py