DOC: typo  year in Nichols reference (Thanks Daniel P. Bliss for the report)
Merge remote-tracking branch 'origin/master'

* origin/master:
  RF Function plot_confusion() is no longer part of the commit. With this gone, the interface of matshow() is perhaps not the best choice anymore. It does not allow (easily) to modify some of the default behavior of matplotlib's mathshow(). For example, forcing all labels to be plotted. Though this can always be done by means of postprocessing.
  BF: Remove trailing whitespace and remove unconditional pl.show()
  BF: More tests; disable undesired conditional
  RF: viz.imshow.matshow -> viz.matshow
  RF: imshow -> matshow
  RF: Change imshow return value to be just the image handler
  Remove trailing whitespace and reformat.
  BF keyword numbers of imshow now also accepts a dictionary and plot_confusion has now the same interface as the plot function of the old ConfusionMatrix class w.r.t. numbers
  0.0.2 This is the first version of the accompanying confusion matrix plotting function. What is still missing from the old functionality is the "grouping feature". But we can plot a subset of the labels/matrix now. The current interface of plot_confusion/imshow looks a bit clumsy...
  0.0.2 Hopefully everything that can/should  be realized by the current interface
  0.0.1 Nothing more than a test...:  Bitte gebe die Versionsbeschreibung für deine Änderungen ein. Zeilen, die mit '#'