Removed netCDF4 from install_requires.
Removed netCDF4 from install_requires.

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