Release 0.52
0.51 release
Prep for 0.50.
Prep for 0.42.
Remove unknown classifiers from setup.py.
Release 0.40.
Prep for 0.25 release. Add bitcoin_address_for_script method, and a few other minor things.
Prep for 0.24 release.
Prep for 0.23 release.
Update to 0.22.