Changed to only build docs on linux, py27, np110.
Changed to only build docs on linux, py27, np110.

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