Cleaned up project related files.
Some fixes to get waartaa running with Meteor 0.7.1.2.
Use 'oplog-limits-preview-1' release for meteor.

This release implements support for limit query in mongodb cursor using
the OPLOG driver. With OPLOG support enabled for publishing channel logs,
there's a huge reduction of CPU usage in the MongoDB server.
Add missing 'extraSignupFields' in Accounts.ui.config.