* Added raster_funcs module to hold functions that operate on RasterModelGrid.
* Added raster_funcs module to hold functions that operate on RasterModelGrid.



ManuSchmi88/landlab,RondaStrauch/landlab,laijingtao/landlab,cmshobe/landlab,RondaStrauch/landlab,ManuSchmi88/landlab,csherwood-usgs/landlab,landlab/landlab,landlab/landlab,laijingtao/landlab,amandersillinois/landlab,decvalts/landlab,SiccarPoint/landlab,landlab/landlab,decvalts/landlab,RondaStrauch/landlab,SiccarPoint/landlab,cmshobe/landlab,amandersillinois/landlab,Carralex/landlab,ManuSchmi88/landlab,cmshobe/landlab,csherwood-usgs/landlab,Carralex/landlab,Carralex/landlab