Adapted Db schema to fit with API and Frontend

@ Table "pubs"
--------------------
- 'entry_fee' - delete (should be available only for events)
- 'notice' - delete (no added value, not communicated with frontend)
- 'happy_hour' - added (cf. filtering options in Frontend)

@ Table "temporal_event"
- 'kitchen_hours' - delete (Isn't used in frontend)
- happy_hour weg (Isn't used in frontend)
- 'entry_fee' - change type to "text" (if price is know -> state price;
if price is not know -> state "paid"; if no price -> state "free") ...
cf. : http://wiki.openstreetmap.org/wiki/Proposed_features/Price_tags

--> Table "temporal_event" is used for typical events (like Sport,
Concert, Party) only.