includes ember-data via npm and removes ember-cli-ember-data

ember-cli-ember-data has been deprecated because
ember-data now has naitve add-on support for ember-cli.

ember-data version can be specified using bower -
right now, there is a bug with hasManySerializer in
ED beta.10, so we're sticking with beta.9 via bower.

for some unknown reason, npm does not have ember-data
versions < bata.10, which is why we're using bower.

Signed-off-by: Sam Heuck <sam@astonishdesigns.com>