Add support for installation via bower

`tv4` is already available for installation via `bower install tv4`, however, as it does not include a `bower.json` it installs a lot more than you actually need in the frontend.

[![bower-logo](https://f.cloud.github.com/assets/9906/590610/461c6506-c9e8-11e2-96ab-720a0f5b07a9.png)](http://bower.io)