Update build
Fix import from rsvp module

The rsvp module exports a bunch of named exports, but `import RSVP from
"rsvp"` would try to get the default export, which is undefined.

Tested against rsvp master (06b0664) in a sample ES6 app.

This was not exposed by the test suite because the test suite uses
global-module builds of router and rsvp, which are unaffected by this
difference. Once we migrate tests/tests.js to ES6, this will be easier
to test, but for now let's leave it.
Update build
Merge pull request #66 from joliss/es6-import

Fix import from rsvp module