Tweak to play nice with Sandstorm

Hi,

I already spoke with Frederick about this: I'm porting your game to Sandstorm (https://sandstorm.io). I'll be talking about it at Meteor Devshop on Thursday.

In this PR I make some very small changes to make this smoother:
- Updated to latest Meteor (the new `--directory` option I added to `meteor bundle` is needed by the Sandstorm dev tools).
- Made the code play nice with non-username login, e.g. by displaying the user's profile name instead. I figured profile names are preferable whenever they exist, so made them take precedence. I haven't actually enabled any other login modes in this change, but Sandstorm has its own login system; with this change, it integrates nicely.

No other code changes will be needed by the port. I'll just run the tool and be done. :)