Fix 228 - Use bower to fetch app externals

Fixes #228
Absolutely.

About `farbtastic`, we definitely can. I thought `1.3u` was a branch. But, it's a tag. So, we're good. Fixed by

About `nmrugg/LZMA-JS`, I'm using the commit hash. Because it fixed https://github.com/nmrugg/LZMA-JS/issues/4 and by the time there was no subsequent tag. Now, we should evaluate upgrading this library and using a more recent published tag.