Work

Meteor 1.7 is in RC now. Update to it.

• Do meteor update
• Update the docker-compose mongo database to the same version as used by Meteor 1.7.
• Update the mongodb npm package to the same pinned version that Meteor 1.7 includes.

This should also fix #3861

Testing

1. Make sure there are no errors on startup when using reaction command to run.
2. Make sure there are no errors on startup when running with docker-compose.
3. Test all of the main test scripts. Make sure no errors appear on client or server.