hammer NUMTHREADS in travis build to 1 to see if first build stops getting killed
hammer NUMTHREADS in travis build to 1 to see if first build stops getting killed

DougFirErickson/PDAL,Sciumo/PDAL,jwomeara/PDAL,jwomeara/PDAL,DougFirErickson/PDAL,radiantbluetechnologies/PDAL,DougFirErickson/PDAL,mtCarto/PDAL,Sciumo/PDAL,jwomeara/PDAL,jwomeara/PDAL,mpgerlek/PDAL-old,radiantbluetechnologies/PDAL,boundlessgeo/PDAL,mpgerlek/PDAL-old,mtCarto/PDAL,lucadelu/PDAL,boundlessgeo/PDAL,Sciumo/PDAL,mtCarto/PDAL,mtCarto/PDAL,lucadelu/PDAL,boundlessgeo/PDAL,Sciumo/PDAL,mpgerlek/PDAL-old,lucadelu/PDAL,radiantbluetechnologies/PDAL,radiantbluetechnologies/PDAL,lucadelu/PDAL,boundlessgeo/PDAL,DougFirErickson/PDAL,mpgerlek/PDAL-old