Added builds for Python 2.6.
Added builds for Python 2.6.

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