Update README.md, wrapping, include files in response to code review

[Leengit]

README todos:
    - Installation
    - Usage
    - License
    - Jupyter MyBinder link (mybinder.org)
Wrapping:
     - rm itkMinimalStandardRandomVariateGenerator.wrap
include:
    - rm itkMinimalStandardRandomVariateGenerator.h 
    - rm "itk::" namespace spec
    - Add brief description, long description to class Doxygen
    - Doxygen comments for all parameters, describing them
    - PixelHelper protected
    - Virtanen algorithm names should include NMF
    - *m_inputPtr -> m_Input (cache only reference image)
    -  rm const ImageType *m_inputPtr;
    - Test suite:
        - 3D dataset test
        - ...
        - caching check test (check whether suppressed colors have changed)
TimeStamp m_inputTimeStamp;