Introduce bower.json file for Bower install.

Great work on the PrettyEmbed.js plugin.  I'm using it on a project, and I rely on Bower for components and dependencies.  I quickly created a fork that allows you to install PrettyEmbed.js with `bower install jonathanmoore/PrettyEmbed.js`.  Currently the bower component is marked as private, but if you want to register it installing the plugin could be as simple as `bower install PrettyEmbed.js`.

Additionally in the `bower.json` file FitVids 1.1.0 is listed as a dependency so that using bower install will make sure that the latest version of FitVids is installed.