Handle FunctionExpression in peacock
Handle FunctionExpression in peacock

refs #9752

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