Stoner

This is the first release of the 0.9.x cycle. Highlights include:

* Refactoring of the package into a more granual core, plot, formats, folders packages with submodules
* Overhaul of the documentation and user guide
* Dropping support for the older Stoner.Image.stack.ImageStack class
* Droppping support for matplotlib<2.0
* Support for Python 3.7
* Unit tests now > 80% coverage across the package.

2nd release candidate for 0.9.0 release

First release candidate of the 0.9 branch.

First alpha release for version 0.9.0 branch.

First bug fix to the stable release series.

d549c4c Fix tests for Stoner.Util
eb750da Correct mis-spelled keyword in Stoner.Util.hysteresis_correct
5ac6b31 Fix for bugs in QD software not setting number of data columns equal to number of column headers
6643e87 Fix of spline function with error column
1fa619f Fix a little bug in hysteresi_correct with pushing masks to find saturation
96f461d Fix error calcualtion in divide method