Qtpylib

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- Check for ``dbskip`` on ``Blotter.mysql_connect()`` (issue 75)
- Changed numpy.std() estimator bias (ddof = 1)
- Fixed Heiken-Ashi bar calculation
- Added Zero-lag SMA/EMA/HMA
- Misc bugfixes and code improvements


*September 25, 2017*

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- Fixed possible miscalculation of local machine's timezone (hotfix)

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- Futures spec is now downloading from `qtpylib.io <http://qtpylib.io/resources/futures_spec.csv>`_ (updated daily)
- Technical indicators made faster
- Added ``tools.multi_shift`` method to for shifting multiple rows in Pandas DataFrames
- Misc bugfixes and code improvements

*July 26, 2017*

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- Checks for ``Python >= 3.4`` before running
- Requires ``ezIBpy >= 1.12.56``
- Option to group contracts togther (groundwork for spreads / combo orders)
- Allows to add contracts/symbols to ``Algo`` *after* initialization via ``Broker.add_instruments(...)``
- ``Algo`` instruments now accepts IB Contracts as instruments
- Instrument's ``get_ticks()`` and ``get_bars()`` returns ``None`` when empty and reqested in ``dict`` format
- Added ``instrument.get_price()`` and ``instrument.price`` (returns current market price)
- Added ``instrument.pnl_in_range(min, max)`` method to the instrument object
- Added ``TotalPNL`` to the portfolio object (``unrealizedPNL + realizedPNL``)
- Added option to get timezone as delta in ``tools.get_timezone()``
- Better Heikin-Ashi candle formula (fixed first candle's open calculation)
- Improved Stochastic indicator
- Added Awesome Oscillator indicator
- Added TDI (Traders Dynamic Index) indicator
- Added ``crossed()`` indicator (returns ``True`` if first series crosses above or below second series)
- Crossing indicators/methods works with numbers as 2nd series (ie ``bars['close'].crossed_above(30)``)
- Misc bugfixes, code improvements, cleanup and abstraction


*May 7, 2017*

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- Requires ezIBpy >= 1.12.51

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- Better PEP8 compliance
- Checking for Python version >= 3.4
- Upgraded to Twilio version >= 6.0.0
- Improved Stochastic indicator
- Added Awesome Oscillator and TDI indicators
- Misc bugfixes, code improvements, cleanup and abstraction


*March 25, 2017*