added role for wildcard capable CSVConfigReader
rescale role class now inherits from CSVConfigReader
removed rescaling defaults from code and added flexible linear scaling function
add lower limit clipping to square-root enhancement
made awips config reader be a subclass of the CSVConfigReader
Made custom P2GProj to make use easier. Needs testing and reorganization.
Moved new Proj class to polar2grid.proj (required rename).
Changed wgs84_fit grid to be closer to old pixel size.
Merge branch 'wildcard_configs' into develop

Conflicts:
	py/polar2grid/polar2grid/awips/awips_grids.conf
	py/polar2grid/polar2grid/ll2cr.py
	py/polar2grid_core/polar2grid/core/rescale.py
	py/polar2grid_core/polar2grid/core/rescale_configs/rescale.16bit.conf
	py/polar2grid_core/polar2grid/core/rescale_configs/rescale.8bit.conf
	py/polar2grid_core/polar2grid/core/rescale_configs/rescale_inc.16bit.conf
	py/polar2grid_core/polar2grid/core/rescale_configs/rescale_inc.8bit.conf
	py/polar2grid_core/polar2grid/core/roles.py
readded VIIRS SST in awips config for Hawaii and other cleanups