Added 'interpolation_none_vs_nearest' example, without .DS_store files
Update interpolation_none_vs_nearest.py

Minor rewording to "interpolation_none_vs_nearest.py" description.
Update CHANGELOG
Update interpolation_none_vs_nearest.py

Changed the last few lines so that the auto-documentation build process correctly displays the results of the example.
Added a static version of 'None_vs_nearest-pdf.png'
Merge branch 'image-interpolation-example' of github.com:Stretch97/matplotlib into image-interpolation-example
Merge pull request #2995 from Stretch97/image-interpolation-example

Added 'interpolation_none_vs_nearest' example, without .DS_store files