Added builds for Python 2.
Added builds for Python 2.

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