Now fully compliant with the GatingML 2.0 specification.
* Full support for GatingML Quadrant gate
* Now supports Ellipsoid gates of any dimension (not just simple 2-D ellipses)
* Sample class now takes any Transform sub-class, consistent with GatingStrategy transforms
* A new fancy logo!
* BUGFIX: fixed issue where the HyperlogTransform would fail on 2-D arrays