Bump version.
Fix percent cloud calculation.
Whitespace.
Specify that devtools must be loaded to install teamlucc.
Fix bug in finding mask file name.
Merge commit '5e7c9c03bf80f504ccd56248fb1ac73a8e436e11' into development

Conflicts:
	DESCRIPTION
Try a fix for gdal build error.
Fix auto-locating mask stack.

Also try a different fix for travis gdal build error.
Add GIS PPA.
Save copy of the masks along with the predictors.
Support calculating predictors without supplying a DEM.
Whitespace.
Update classification functions.
Bugfixes to new classification functions.
More fixes to new classify functions.
Rename functions for clarity.
Update docs.
Output image even when no fill is performed.

Also fix docs.
Add auto_normalize function.
Improve error checks.