Add PyPi upload date for release 0.3.2

As according to https://pypi.python.org/pypi/pygeoip/

add NETSPEED_Edition_* databases to "supported"

Since, well, the API claims to be supporting them (and soon will!)

Add support for NetSpeedCell databases

Improve exception handling

Adds a generic error handler for unsupported databases, and makes the error messages for ipv4 and ipv6 exceptions more verbose and less stilted. Response to #68.

Resolves appliedsec/pygeoip#64

Justice should be served: add missing Kiev region ID

Sphinx documentation for readthedocs.org
Fixes #50