Added ``bower_components`` directory.

Heroku does not support file storage during deployment,
a different approach with bower must be taken on the deployment
process to make sure bower is run and the output files stored in
AWS S3.

For now all the static dependencies have been added to the
``us_ignite/assets``.
Update output directory for the ``bower`` dependencies.
Avoid ignoring the ``bower_modules`` directory.
Add ``/kit/`` url.