moved the transaction version (currently fixed to 1.0) from the outer
"transaction" object to the inside part, where it will get hashed
together with the rest of the transaction.
updated docs accordingly.
* create votes table and indexes
* initial db call rewrite
* setup votes table in tests
* rewrite election status
* update api tests
* update tests
* bigchaindb set-shards should change 'votes' table too
* Forgot to add change to bigchain.py in last commit
* update test
* move exceptions
* collapse line
* revise test
* remove obsolete test
* remove votelist from blocks
* sharding and replication
* documentation changes
* language change
* more readable assertions
* fix exception
* test exceptions
* remove parameter
* remove loop
