Stoner

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

First release of the new stable branch 0.8.0 with a wheel on pypi and conda packages on the phygbu channel.

Highlights include:

* Reworking of the ImageArray, ImageFile and ImageFolder with many updates and new features.
* New mixin based ImageStack2 that can manipulate a large number of images in a 3D numpy array
* Continued re-factoring of DataFolder using the mixin approach
* Further increases to unit-test coverage, bug fixes and refactoring of some parts of the code.
* _setas objects implement a more complete MutableMapping interface and also support +/- operators.
* conda packages now being prepared as the preferred package format

Beta release of 0.8 for conda package build

Minor bug fixes plus add some useful tility tools

First bug fix release on 0.7 branch - corrects a problem with writing metadata with keys that are a subset of an existing key.