Upgrade bitcoin to 1.1.27.
Upgrade bitcoin to 1.1.27.

* Many tests added and a few bugs fixed.
* The package is now compatible with Python 3.

freebazaar/FreeBazaar,NolanZhao/OpenBazaar,Renelvon/OpenBazaar,matiasbastos/OpenBazaar,mirrax/OpenBazaar,rllola/OpenBazaar,freebazaar/FreeBazaar,must-/OpenBazaar,bglassy/OpenBazaar,matiasbastos/OpenBazaar,saltduck/OpenBazaar,mirrax/OpenBazaar,mirrax/OpenBazaar,blakejakopovic/OpenBazaar,tortxof/OpenBazaar,tortxof/OpenBazaar,NolanZhao/OpenBazaar,must-/OpenBazaar,atsuyim/OpenBazaar,saltduck/OpenBazaar,freebazaar/FreeBazaar,bankonme/OpenBazaar,bankonme/OpenBazaar,NolanZhao/OpenBazaar,bankonme/OpenBazaar,tortxof/OpenBazaar,matiasbastos/OpenBazaar,freebazaar/FreeBazaar,matiasbastos/OpenBazaar,bglassy/OpenBazaar,habibmasuro/OpenBazaar,bglassy/OpenBazaar,must-/OpenBazaar,bglassy/OpenBazaar,NolanZhao/OpenBazaar,blakejakopovic/OpenBazaar,atsuyim/OpenBazaar,atsuyim/OpenBazaar,freebazaar/FreeBazaar,tortxof/OpenBazaar,habibmasuro/OpenBazaar,bankonme/OpenBazaar,saltduck/OpenBazaar,must-/OpenBazaar,blakejakopovic/OpenBazaar,habibmasuro/OpenBazaar,rllola/OpenBazaar,rllola/OpenBazaar,rllola/OpenBazaar,blakejakopovic/OpenBazaar,Renelvon/OpenBazaar,Renelvon/OpenBazaar,atsuyim/OpenBazaar,Renelvon/OpenBazaar,mirrax/OpenBazaar,saltduck/OpenBazaar,habibmasuro/OpenBazaar