Make libmesh build scripts more flexible
Make libmesh build scripts more flexible

Refs #2460

sapitts/moose,andrsd/moose,nuclear-wizard/moose,milljm/moose,YaqiWang/moose,YaqiWang/moose,SudiptaBiswas/moose,SudiptaBiswas/moose,bwspenc/moose,harterj/moose,sapitts/moose,dschwen/moose,harterj/moose,harterj/moose,idaholab/moose,milljm/moose,jessecarterMOOSE/moose,SudiptaBiswas/moose,milljm/moose,laagesen/moose,dschwen/moose,milljm/moose,lindsayad/moose,laagesen/moose,idaholab/moose,andrsd/moose,dschwen/moose,dschwen/moose,andrsd/moose,SudiptaBiswas/moose,nuclear-wizard/moose,dschwen/moose,idaholab/moose,bwspenc/moose,sapitts/moose,bwspenc/moose,permcody/moose,harterj/moose,milljm/moose,idaholab/moose,SudiptaBiswas/moose,permcody/moose,nuclear-wizard/moose,YaqiWang/moose,laagesen/moose,laagesen/moose,lindsayad/moose,sapitts/moose,andrsd/moose,bwspenc/moose,lindsayad/moose,andrsd/moose,lindsayad/moose,permcody/moose,YaqiWang/moose,jessecarterMOOSE/moose,nuclear-wizard/moose,laagesen/moose,permcody/moose,bwspenc/moose,harterj/moose,jessecarterMOOSE/moose,jessecarterMOOSE/moose,lindsayad/moose,idaholab/moose,jessecarterMOOSE/moose,sapitts/moose