Add the possibility to filter events by projects; visually, the should be a list of projects (either in a dropdown or as a checklist) and by clicking (or enabling/disabling) events should instantly show or hide.

Tasks:

1. Define a way to associate events to projects; this can be done by defining string matching between project names and the event title during the event fetching/parsing (googleapi2events.js)
2. Populate the project field in events.json
3. Render out the list of projects (create a set from the list of all project fields in events.json) as a checklist or drop-down, somewhere in the event grid page
4. Filter events in FullCalendar based on the project event field (this code can be partially reused)
5. Add the project field in the event details popup

cc @jgavronsky , as she suggested this enhancement