Added model.js for common model-related members, and server/serve.js for server-side script.

- Also added .gitignore to root dir.
- MusicMgr.js now attempts to display all records found in the Events collection, but I couldn't get that working yet.
Properly set up 'event' template in dashboard.html and the functions to populate it in MusicMgr.js.

- Also added startup function on server to create test data if no event data exists.