switch to setuptools
update MANIFEST.in
use ``south`` migrations
code clean-up
add ``conf`` module to store app related settings
returns ``active`` currencies by default
make sure ``base`` currency is always active
``get_currency_code`` from request with fallback to default or None
replace ``context_processors`` with ``middleware``
code clean-up
update el,es translation
update requirements
rewrite template tags using ``classytags`` helper
add ``ru`` translation