Blockchain
* Check if all block could be fetched added
* Thread and Worker class for block fetching added

* Unit test for issue #27 added
* Exception handling added to blocks using threads
* get_all_accounts fixed for appbase calls

Block
* fix missing identifier
* fix change trough json_transactions
Blockchain
* Check for missing blocks added to blocks with threads

Account
* _parse_json_data improved and all missing ints and dates added
* json() adapted to _parse_json_data()
Block
* _parse_json_data added, expiration and timestamp are now datetime objects
* property json_transactions and json_operations added, which return trx and ops with date strings
* BlockHeader improved and datetime parsing added
Blockchain
* adapted to new datetime objects
CLI
* adapted to code changes
Comment
* int and dates inside active_votes are parsed
* Missing dates and int are parsed
Market
* date parsing to datetime added to market_history
Vote
* Some improvements
Witness
* _parse_json_data added
* all date and ints are parsed
* Demo added to Witnesses, WitnessesVotedByAccount, WitnessesRankedByVote and ListWitnesses 
beemgraphenebase/types
* datetime handling added to PointInTime
Unit tests
* test_account adapted
* test_export added to test_block
* test in test_comment fixed
* test_export added to test_witness

Account
* lazy and full are correctly passed
* _parse_json_data() added to parse json
Block
* lazy and full are correctly passed
* empty operations are handled
* op_statistics improved
Blockchain
* virtual ops and ops statistics are seperatly calculated
Comment
* _parse_json_data() added to parse dates and amounts
* author_reputation is parsed to int
* lazy and full are correctly passed
Vote
* lazy and full are correctly passed
* _parse_json_data added to parse date and rshares and reputation
* vote.time is a datetime object
* json() returns the original string
Witness
* lazy and full are correctly passed
GrapheneRPC
* time_limit removed, as it supresses KeyboardInterrupt
* ws.settimeout() is set for websocket
* WebSocketTimeoutException  handling added
Unit tests
* test_account fixed
* test_time_limit removed from test_steemnoderpc
* checks added to test_blockchain_batch

Documentation updates

Comment
* Add example
Steem
* improve docu
Exception
* Add TimeoutException
GrapheneRPC
* add time_limit to implement a timeout for websocket connection
Unit test
* add test for timeout implementation

Account
* json_metadata property
Blockchain
* add addTzInfo
Comment
* fix meta edit of post
Steem
* add use_stored_data

Account
* Account handling is improved and it is assured that an Account object or an account string name can be used in every function
Readme
* Advantages over the official steem-python library added (fixes #25)

Fix unit tests and WitnessesRankedByVote

Transactionbuilder
* Prepare broadcasting in new appbase format
* Force condenser_api by now
RPCUtils
* Improve detection of conenser_api
Streemnoderpc
* Improved error message for Assert Exception:v.is_object()
beembase.Object
* Add new appbase Operation format
beemgraphenebase.object
* Add handling of new appbase operation format

Market
* _weighted_average, btc_usd_ticker, steem_btc_ticker and steem_usd_implied added
Witness
* get_votes_sum added to witnesses object
Graphenerpc
* fix handling of WebSocketConnectionClosedException
CLI
* witnessfeed: uses the new market ticker to calculate the current steem_usd price as base. When using support-peg the sbd_usd price is calculated from the internal ticker and used for quote.
* Witness: shows the rank and active rank (when it is below 250). virtual_time_to_block_num is calculated from num_scheduled_witnesses, VIRTUAL_SCHEDULE_LAP_LENGTH2 and vote_sum. This is then used to estimate the next block producing time.
* witnesses uses a proxy now, when set.

blockchain.awaitTxConfirmation() fix timeout

actually wait `limit` blocks before raising an exception