Fastbt

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* New methods added to `TradeBook` object
* mtm - to calculate mtm for open positions
* clear - to clear the existing entries
* helper attributes for positions
* `order_fill_price` method added to utils to simulate order quantity

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* Simple bug fixes added

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* `OptionExpiry` class added to calculate option payoffs based on expiry

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* Brokers module deprecation warning added
* Options module revamped

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* More helper functions added to utils
* Tradebook class enhanced
* A Meta class added for event based simulation

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* Backtest from different formats added
* Rolling function added


v0.1.0. (2018-10-13)
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* First release on PyPI