pass project to livereload-server

Fixes an issue with aeb015594632fa4d5b1af1247ea59f8a01d903e3

https://github.com/stefanpenner/ember-cli/blob/aeb015594632fa4d5b1af1247ea59f8a01d903e3/lib/tasks/server/livereload-server.js#L56-L58

`project` was not passed to the `livereload-server`-task, causing the `ember serve` task to hang.