massive improvements

bitshares/__init__.py

bitshares/account.py

bitshares/aes.py

bitshares/amount.py

bitshares/asset.py

bitshares/bitshares.py

bitshares/block.py

bitshares/blockchain.py

bitshares/dex.py

bitshares/exceptions.py

bitshares/market.py

bitshares/memo.py

bitshares/price.py

bitshares/storage.py

bitshares/transaction.py

bitshares/utils.py

bitshares/wallet.py

bitsharesapi/__init__.py

bitsharesapi/noderpc.py

bitsharesbase/__init__.py