Pycoin

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* add some support for testnet
* add support for ripemd160 in Google App Engine
* add a BIP32 wallet subkey cache

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* fixed two bugs specific to Python 2.7 (thanks to Peter D. Gray)

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* now works with Python 3.2
* added "bu" command-line utility
* improvements to "spend" command-line utility
* added some blockchain.info utilities
* first crack at transaction fee conventions
* rename public_pair_from_sec to sec_to_public_pair

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* transaction signing is much easier to use now
* massive refactoring of script package

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* a few speed-ups
* fix genwallet script

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* first crack at support for Python 2.7
* rename ripemd160_sha256 to hash160
* add a bunch of pydoc comments
* first crack at genwallet.py utility (need a better name)
* very preliminary crack at spend.py utility
* reduce Tx database that's required to be passed to the "sign" method
to include bare minimum of data (the output script for a given hash/index)
* change ":pub" keypath suffix to ".pub" (still not sure about this)
* lots of refactoring, parameter renaming, moving things around
related to signing and verifying transactions. Better, but still
not perfect.