Bump version post release
s/cStringIO/io for Python 3 compability
Remove coredefs import in messages.py

coredefs.py does no longer exist. It has been removed with
28518d296cfa996fb9b95e6b0deafcf98bd93caf
Add missing (MIN_)PROTO_VERSION definitions

They got lost when coredefs.py was removed, but are still used by
messages.py.
Encode -1 as OP_1NEGATE

See BIP62
Strict deprecated, changed to keyword arguments.
Document bitcoin.SelectParams() better
Add getbalance() to rpc.Proxy()

New tests.

Complete tests for op effects in unevaluated if - 3 new bugs.

Forgot some comments.

Removed OP_DROP

Single test.

Forgot this one.

Tests.
test