Backtrader-paperswithbacktest

- UltimateOscillator added. Requested with ticket 103
- VisualChart Live Data Feed/Trading integration
- Add YahooFinanceData (online) to formats supported by btrun

- InteractiveBroker Live Data Feed/Broker
- Rework of many internals to support live feeds
- DateTime Management (timezones) support added
- Extra Rework of Resampler/Replayer to support live feeds and earliest
possible bar delivery

- Fixes 99 by conditionally importing ib modules

- safediv added to Stochastic from Pull Request 97
- Initial integration fo ib feed/broker. Can operate but it is not yet fully
ocmplete
- Comprehensive ib testing sample
- Added "store" and "data" notifications to cerebro and strategy for the
integration of live feeds
- Internal datetime clarifications
- Fixes 94 removing leftover decode('utf-8') after removing 'b' from 'rb'
when opening csv files
- Fix bug in strategy.close and add plimit support to it
- Some documentation updates

- Memory saving schemes (exactbars parameter to cerebro) full implemented
- Add mixing-timeframes to the docs
- Add memory-savings to the docs
- Cosmetic corrections to data-resampling sample

- Address 84 86 by implemting a LinesCoupler lines object which fills longer
timeframe lines with shorter timeframes
- Add sample for LinesCoupler
- New links for readthedocs io domain
- Detection Improvement for objects supported by writers