Added numpy-style docstrings.
Added numpy-style docstrings.

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