Forgot to fix up blockchain.py given the pycoin stuff.
Merge pull request #34 from jimmysong/34

Forgot to fix up blockchain.py given the pycoin stuff.
p2ptrade work-in-progress (doesn't work!)
Issue #11: parse values.

Also affects the definition of the "bitcoin" asset to default to full bitcoins.
Also affects the "balance" and "send" commands (not tested!)
Merge pull request #35 from arichnad/master

Issue #11: parse values.