More tests fixed

docs/dex.rst

docs/steem.rst

docs/worker.rst

steem/__init__.py

steem/account.py

steem/asset.py

steem/blockchainobject.py

steem/committee.py

steem/dex.py

steem/exceptions.py

steem/price.py

steem/steem.py

steembase/objects.py

steembase/operations.py

tests/test_account.py

tests/test_base_objects.py

tests/test_message.py

tests/test_price.py

tests/test_proposals.py

tests/test_transactions.py