fix logger not rotating log files except on startup/shutdown

Signed-off-by: Thomas Stilwell <stilwellt@openlabs.co>
Migrate to bitcoin from pybitcointools. Fix #552.

* Replace privtopub with privkey_to_pubkey.
Silences unnecessary error log on shutdown.
_on_raw_message cleanup

Readjusted the organization of the method.

Fix on_order messup

Remove unused seed_contract_json

This was originally logged for convenience but it's unnecessary work.

Remove unused seed_contract

Conflicts:
	node/connection.py
Cleanup Fixes

- Convert old methods to Cryptor objects
- Remove old debugging statements that crept in somehow
_on_raw_message cleanup

Readjusted the organization of the method.

Fix on_order messup

Remove unused seed_contract_json

This was originally logged for convenience but it's unnecessary work.

Remove unused seed_contract

Conflicts:
	node/connection.py