Revert "Set number of OpenMC threads to 4 for Travis runs. Hopefully this should help"
Revert "Set number of OpenMC threads to 4 for Travis runs. Hopefully this should help"

This reverts commit bb54750b91f462960e993fc1f609410ced16a391.

walshjon/openmc,amandalund/openmc,wbinventor/openmc,smharper/openmc,shikhar413/openmc,smharper/openmc,kellyrowland/openmc,paulromano/openmc,liangjg/openmc,mjlong/openmc,paulromano/openmc,johnnyliu27/openmc,liangjg/openmc,liangjg/openmc,walshjon/openmc,lilulu/openmc,mjlong/openmc,bhermanmit/openmc,smharper/openmc,shikhar413/openmc,smharper/openmc,shikhar413/openmc,paulromano/openmc,amandalund/openmc,walshjon/openmc,lilulu/openmc,liangjg/openmc,johnnyliu27/openmc,mit-crpg/openmc,samuelshaner/openmc,wbinventor/openmc,amandalund/openmc,mit-crpg/openmc,shikhar413/openmc,amandalund/openmc,paulromano/openmc,mit-crpg/openmc,wbinventor/openmc,johnnyliu27/openmc,wbinventor/openmc,lilulu/openmc,walshjon/openmc,samuelshaner/openmc,samuelshaner/openmc,bhermanmit/openmc,samuelshaner/openmc,johnnyliu27/openmc,mit-crpg/openmc,kellyrowland/openmc