Added skeleton EntityManager and made Event implement the WPI Suite
Model interface.
Merge branch 'dev' into server_database_dev
Cleaned up some references to PostBoard in CalendarEventEntityManager
Added EventEntityManager to WPI Suite Core
Basic implementation of Event.toJSON
Also made a few other changes to Event to make it work better as a Model
Added a boilerplate header and JSON deserialization.
Added basic implementation of some EventEntityManager functions.
Basic implementation of a few EventEntityManager methods.
Most are still unimplemented but throw relatively helpful exceptions if
called.
Merge pull request #1 from frenchie16/server_database_dev

Merged server_database_dev into dev