Updates broccoli-dist-es6-module to v0.2.0

The old version has broken dependencies. As a result, Brocfile.js needed to be
updated. compileModules now returns an object instead of an array.
Removes tildes from package.json

They have been the root cause of broken builds, so now depedency versions
are explicit.
Merge pull request #1 from lytics/issue/1-broken-npm-install

npm install won't finish