changed path of config/config.ini

updates to config

refactored auth in streaming_prices.py

'changes to configparser and rates specified for streaming'

changed config/config.ini and README.md

updated readme regarding backtesting options

added instrument_candlestick_ohlc.py

updated README.md

updated README.md

added historical_data.py, streaming_prices.py, and transaction_history.py modules

updated position_management.py, PositionDetails() & PositionClose()

updates to position managment, partial or full trade close

added trade management module

revising comments, etc

revising comments, etc