Fix 228 - Use bower to fetch app externals

Fixes #228
Comparing the previous committed farbtastic against the original v1u3, we have this difference https://gist.github.com/rxaviers/ad1f1e45c825e8c0a0c8.

In order to use the external file, we need to move the "hack" into our own code.

The next (correct) step is to use a proper code instead of overloading the above farbtastic method.