Replaced explicit 7 with B
Added curve changing
Added function returning G
Added function returning G
Made code more generic for A nonzero
A few more SIGHASH fixes
corrects the constant for SIGHASH_ANYONECANPAY and adds support for
hashcode in the sign function for standard payments
Merge branch 'more_hashcode_fixes' of github.com:Zah6ooheew/pybitcointools into more_hashcode_fixes