* Add Protective Collar Option Strategy
* Add buying power model for Protective Collar
* Add unit test for Protective Collar
* Add regression test for Protective Collar
* Add unit test on position group buying power
* allow same strike for later abstraction
* minor bug fix
* Set up conversion option strategy
* add margin requirement
* add unit tests
* Add regression test
* add reverse conversion definition
* add reverse conversion and refactor conversion/collar margin model
* added/modified unit tests for conversion/reverse conversion
* minor bug fix on unit test, add regression test
* Address peer review
* update new set of IB testing data
Louis Szeto
39bfbccd44