chore(compress): create release zips

As we're approaching a release, release zips must be available
for download.
chore(bower.json): leave version out

As recommended by Bower authors, version property isn't needed,
as it's guided by git tags.
chore(bower.json): add description property
chore(tasks): place common config into cfg.yml

As a few strings are repeated a lot in our Grunt tasks, we don't
want to have to change them in every single  when something
changes. For this reason, a new file called cfg.yml has been
added in this commit, which will contain a these strings.
docs(getting started): set package download url

Download urls were missing for production/development packages.
This commit adds them.
chore(dist-bower): create dist-bower task

dist-bower will be used to update references to dist files of Frontkit
in HTML files. They will be replaced with a http://rawgit.com url for
our brother repo injoin/bower-frontkit.
chore(dist-bower): add target for dist-bower