Change Detection and Landsat Tools

Added scripts, toolboxes and updated README.md.
Updated Readme files
Merge pull request #163 from helyx-amcmillan/master

Change Detection Tools, Landsat Tools added, and Readme files updated
Updated to NumberFeatures.py for Desktop/Pro handling of arcpy.mapping.
Merge pull request #165 from jscott11/master

Updated to NumberFeatures.py for Desktop/Pro handling of arcpy.mapping.
Change Detection Toolbox

Classification Accuracy model added
Merge pull request #166 from helyx-amcmillan/master

Change Detection Toolbox
Merge pull request #167 from mfunk/master

Update README.MDs with links to templates