Updated to Python 3 in headless mode

Major compatibility updates for Python 3.7.

• Run this model in headless mode with Docker
• Dropped ibpy library in favour of the newer ib_insync library.
• Dropped support for Python 2.7.
• Added more links in readme.

Merged pull request from chicago-joe

Merged pull request from: https://github.com/chicago-joe/IB_PairsTrading_Algo

Thanks to chicago-joe for updating to work with Python 3.

As this is only a compatibility update, there are many outdated components and the trading model is quite unlikely to be working as intended.

Initial release

This is the initial production release of the original trading model produced in 2015.
Works with Python 2.7 and the legacy version of IB TWS.