catch zbar.UnsupportedError
use the ca list that ships with requests. update test.
don't show qrcode button in payto if it is a payment request
use x509 to check if server certificate has expired
optional parameters for create_new_address
update comment on x509 class
fix missing import. fixes #738
Made all bip32 primitives testnet compatible.
Made use of fewer constants
Merge pull request #741 from chrisglass/clean-support-testnet

Made all bip32 primitives testnet compatible.
support for OP_RETURN
Fix usage summary
Added base unit 'bits'.
Update tests and fix URI parsing

Update URI parsing for BIP0072 compatability
Update tests for parse_URI
Shouldn't redo URI encoding
Merge pull request #747 from wozz/URI_tests

Update tests and fix URI parsing
Merge pull request #743 from pooler/usagefix

Fix usage summary
Merge pull request #746 from slush0/bits

Base unit 'bits'
fix #745
try pyasn1-modules as well