Fix 228 - Use bower to fetch app externals

Fixes #228
Images removed/fixed.

> Apart from the pointing to a tag issue (or worse, commit, as below).

I didn't get it why you think it's bad. Using a tag and a commit respectively for farbtastic and lzma-js ensure we use the correct state/version of each library. Just let me know if you think this should be changed (and how) please.