[Frei0r] NDVI filter added

From: Dan Dennedy - Date: Sun, 29 Jun 2014 22:16:06 -0700

Just an FYI to let the list know Brian Matherly created a NDVI filter that I just pushed into the repo: http://en.wikipedia.org/wiki/Normalized_Difference_Vegetation_Index

The filter came at the request of someone involved with the citizen environmental drone movement: http://conservationdrones.org/

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