Tests to reproduce bug found by Peter D. Gray.

See https://github.com/richardkiss/pycoin/pull/1
Fix test failures.
Fix another Python 2.7-only problem.
Prep for 0.23 release.
Don´t use distutils. Fixes #3.
Merge pull request #4 from manpages/master

Don´t use distutils. Fixes #3.
Add John Mostovoy as contributor.
Make byte prefixes depend on network type. Fixes #2.
Make public_byte_prefix & private_byte_prefix more Pythonic.
Add tests for testnet wallet generation.
Add a fix from Stephan Wehner.
Added a pass-through for is_test in a couple of places. This is to support the ngcccbase project.
Update CREDITS.
Switch from `/dev/urandom` to `/dev/random`

From the linux man page (http://www.linuxmanpages.com/man4/random.4.php):

"When read, /dev/urandom device will return as many bytes as are requested. As a result, if there is not sufficient entropy in the entropy pool, the returned values are theoretically vulnerable to a cryptographic attack..."

Perhaps this is paranoia, but for something as critical as generating bitcoin wallet keys being extra cautious seems prudent. The downside is that when generating a large number of wallet keys dev/random could block (same link):

"When the entropy pool is empty, reads from /dev/random will block until additional environmental noise is gathered."

I did some non-scientific testing and found I was able to call dev_random_entropy() 10,000 times on my laptop from /dev/random and /dev/urandom in ~46 seconds each. I can't say if there would be blocking issues on a fresh-install of a VM (say that only has shell access) or if my script had called dev_random_entropy() 100x more times. Even if there were potential blocking issues, I think it'd be better to risk massive key generation being a little slow due to blocking vs being a little insecure. Of course users could always decide to use /dev/urandom if they didn't want to risk blocking, this is just changing the default/reference example.

Thanks for releasing such an awesome library (and blog) Richard, it's really great! Apologies if my comment is incorrect, you're much more knowledgeable on this topic than I am.
Fix typo.
Update CREDITS.
Add option to generate JSON in genwallet.
fix to make pycoin work on the Google App Engine
Get ripemd160 working on Google App Engine.
Merge branch 'gae' of https://github.com/sserrano44/pycoin into sserrano44-gae