second version of bitfield-tagged color kernel
tests fixed
solving conflicts with eclipse editor :s
Merge pull request #119 from maraoz/master

implement bitfield-tagged color kernel demo2
Issue #111: Refactor address.py and use pycoin

* Got rid of ecdsa
* Got rid of address.py
* wallet_model now uses pycoin for the ECC math
* wallet_model also uses pycoin for some conversions back and forth with various address formats
Merge pull request #120 from jimmysong/111

Issue #111: Refactor address.py and use pycoin