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* moved passlib.hash package to passlib.drivers
* combined some passlib.driver modules together (eg ext_des_crypt merged w/ des_crypt)
* renamed all hash classes to lower case, to match name attrs.
* renamed ext_des_crypt to bsdi_crypt
* added special proxy module "passlib.hash" which lazily loads drivers from correct location
- registry system reworked, has list of locations for builtin drivers,
and capability for apps to add more
- passlib.hash *is* the registry, changes to it affect list
- thanks to this, documentation can remain, pointing to passlib.hash.xxx as location for driver
* moved passlib.utils.handlers to passlib.utils.drivers, renamed classes from XxxHandler -> XxxHash
* combined all driver tests into single passlib/tests/test_drivers.py file
* NOTE: disabled default unicode testing, not ready for that yet
* all driver UTs pass (others not checked)