Build: Don't cache minified bundles

Don't cache minified bundles that are subject to change due to user selection of
different components.

Fixes #230
2.0.8
App: organize it in app/src and external, build into app/dist

Move everything from app/resources into app/src and external/, given that all
files on external/ should be fetched by bower.

Ref #228
App: Use bower to fetch external dependencies

Fixes #228
(fix) App: organize it in app/src and external, build into app/dist

Why bother specifying the clean target when there is only the one?
(fix) App: Use bower to fetch external dependencies

Coding standard
(fix) App: Use bower to fetch external dependencies

Export farbtastic images as well