Release v1.1.1

Added tests for the new public functions stdNormCDF and getW

Release v1.1.0

Made stdNormCDF a public function for use in other modules
Added a public getW function that calculates omega as defined in the Black-Scholes formula

Release v1.0.2

Modified _stdNormCDF() to avoid divergence
Added more test cases

Release v1.0.1

Removed a meaningless iteration of the loop in _doubleFactorial()
Cleaned up code

Release v1.0.0

First release