The package doesn't seem to be compatible with Meteor v0.8.3. Bummer, wanted to fiddle with it to get a better understanding of packages.
$ mrt add meteor-file
✓ meteor-file
tag: https://github.com/EventedMind/meteor-file.git#v0.0.7
Done installing smart packages
Stand back while Meteorite does its thing
Done installing smart packages
Ok, everything's ready. Here comes Meteor!
=> Errors while scanning packages:
While building package `meteor-file`:
error: no such package: 'spark'