Disable Incompatible Dependencies

[tomdale]

We need some way to tell Ember CLI not to include addons that rely on document/other DOM features in the build output for FastBoot, since they cause the app to raise an exception on boot.

[danmcclain]

This should be considered done since we can use the ENV variable in the ember-cli-build.js

[tomdale]

@danmcclain Is this covered in the docs? If not, I'm happy to close this once it is.

[danmcclain]

@tomdale: I'll check, if not, I'll document and reference this issue 👍