Merge branch 'gtiff' of https://github.com/davidh-ssec/polar2grid into modis
adding new aqua modis grids to the awips grid configuration file
fixed band/kind labeling in file name and added override to use fbf_img if fbf_swath not present
adding modis2awips to the top level callable modules
moving functions into a separate module
moving some functions over to a new module
adding some modis related constants
making some modis related things available outside the package
adding addition files created to support modis in polar2grid
adding new grids for modis
adding conversion to bt for ir bands and some fill value code
adding rescaling info for modis bands
allowing some bt conversion related things to be reached outside the modis module
fixed typing bug in bt calculations and added testing function _test2
adding some constants for bt conversion and some documentation comments
fixed data scaling formula; added fill values to meta data; fixed some fill value logic; various other bugs
various fill value stuff; these are changes that Dave will probably want to replace later with his version of the fill value stuff
added configuration for LST, SST, and Fog grids
added cloud clearing, fog band creation, and reorganized so that files are grouped differently for swath creation
adding new filters module to handle some of the processing of modis data