Added Use nobroadcast for testing and Clear BlockchainObject Caching

Unit tests fixed

* configuration improved
* beempy help for each command added

* Renamed getSimilarAccountNames to get_similar_account_names
* Fix doctest for account, profile, steem and utils

Layout of the doc improved in blockchain, discussions, steem, transactionbuilder, websocket
New content added to quickstart and tutorial

Account
* Examples and Dokumentation improved
Amount
* Example improved
Asciichart
* Examples improved
Blockchain
* examples improved
Discussions
* Doku improved
Market
* Examples and Doku improved
Price
* Examples improved
* Missing steem_instance fixed
Steem
* Example code fixed
Graphenerpc
* Example improved

Formatting of all doc parts improved
Logo and icon added
Doc structure improved
quickstart improved

Account
* Example forget SimilarAccountNames  added
* Example for history and history_reverse improved
Amount
* Example is tested with doctest
Block
* Example is tested with doctest
Price
* Fix example
Profile
* Fix example
Steem
* Example is tested by doctest
Transactionbuilder
* Example is tested by doctest
Vote
* datetime.now() changed to datetime.utcnow()
* Example is tested by doctest
Witness
* datetime.now() changed to datetime.utcnow()
* Example is tested by doctest
Docs
* Installation instruction improved
* Quickstart created
* Discord channel added to support

Fix wallet unlock when using keyring

steem
* add option use_condenser
steemnoderpc
* refactoring
Graphenerpc
* condenser_api calls shen use_condenser=True is set.
unit tests
* test_comment and test_discussion uses 19.4 nodes now

Asciichart
* added ascii charset for python 2.7
CLI
* adapted to new charset

Comment set to full as default
Unit tests for cli and comment improved.

Change to fix Issue #4

Memo
* make prefix changeble
Transationbuilder
* sign() return the signed struct now
Graphenerpc
* Session are used for requests
* Singleton for websocket instance added
* Both measures reduce ram consumption when more than one Steem object is created.
Add missing scrypt package to dependency

cli
* nodes can be sorted by ping times with pingnode --sort
* nodes with error can be removed by pingnode --sort --remove
* add wipe option for createwallet

cli
* set password_storage keyring or set password_storage environment added. password_storage = environment  is the default behavior and compatible with all old version.
* when keyring is used, the wallet password can be stored with the keyring module.
* nextnode when the first node and the current url not matches, will this command changes the nodes list, in way that the first node and the current url matches
* nextnode skipps now not working nodes
* createwallet improved and keyring added
* changewalletpassphrase improved
steem
* set_password_storage added to set the password_storage config
* move_current_node_to_front function added, which shifts the nodes  until current url and first node matches
storage
* add default for password_storage
wallet
* password_storage is used
unit tess
* test_cli adapted
* test_market adapted on changes

AsciiChart
* new ascii curve plot class created
* width and height can defined and plot() prints an ascii string, which can be interpreted as plot
CLI
* keyring functionallity added
* walletinfo shows if UNLOCK env is set, keyring is installed and if it possible to unlock the wallet (--test-unlock)
* ticker shows a table with the latest market prices
* pricehistory plots the history of the last 3 days together with the median price
* tradehistory shows the STEEM/SBD market price history
* orderbook has now a working chart option
* The sum of SBD and STEEM for open orders was added
Unit test
* tests for new cli function were added

* Dokumentation for several functions of market improved
* dict keys for ticker renamed to small names width underscore (identical to python-steem)
* trade_history added. This function allows to fetch a fixed number of trades at each intervall to reduce the time. E.g. it is possible to receive the from the last 7 days 100 trades each 6 hours.
* utc time transformation is added to trades
wallet
* keyring can be used to unlock the wallet. Please store the masterpassword with  python -m keyring set beem wallet

Account
* Example for history and history_reverse added
Market
* base and quote added to init to define what buy and what sell means
Doc
* tutorials improved
Unit tests
* test_market improved

Account
* Improved print_info, table output is possible
Blockchain
* stream is ready for newest changes and work with api.steemitdev.com
CLI
* nextnode, pingnode, currentnode added
Exception
* BatchedCallsNotSupported added, raised when batched blockchain failed
Steem
* set_default_node improved
* get_default_node added
Unit test
* new unit test for new functions added