Added a unit test for shellface constraints.
Added a unit test for shellface constraints.

pbauman/libmesh,pbauman/libmesh,pbauman/libmesh,aeslaughter/libmesh,hrittich/libmesh,friedmud/libmesh,BalticPinguin/libmesh,benkirk/libmesh,friedmud/libmesh,giorgiobornia/libmesh,jwpeterson/libmesh,friedmud/libmesh,pbauman/libmesh,dschwen/libmesh,balborian/libmesh,giorgiobornia/libmesh,hrittich/libmesh,coreymbryant/libmesh,coreymbryant/libmesh,roystgnr/libmesh,aeslaughter/libmesh,aeslaughter/libmesh,vikramvgarg/libmesh,jwpeterson/libmesh,svallaghe/libmesh,BalticPinguin/libmesh,capitalaslash/libmesh,vikramvgarg/libmesh,giorgiobornia/libmesh,hrittich/libmesh,roystgnr/libmesh,coreymbryant/libmesh,90jrong/libmesh,svallaghe/libmesh,friedmud/libmesh,aeslaughter/libmesh,friedmud/libmesh,roystgnr/libmesh,benkirk/libmesh,giorgiobornia/libmesh,libMesh/libmesh,pbauman/libmesh,capitalaslash/libmesh,svallaghe/libmesh,giorgiobornia/libmesh,friedmud/libmesh,dschwen/libmesh,roystgnr/libmesh,jwpeterson/libmesh,vikramvgarg/libmesh,jwpeterson/libmesh,balborian/libmesh,roystgnr/libmesh,aeslaughter/libmesh,dschwen/libmesh,svallaghe/libmesh,jwpeterson/libmesh,capitalaslash/libmesh,libMesh/libmesh,svallaghe/libmesh,capitalaslash/libmesh,friedmud/libmesh,libMesh/libmesh,balborian/libmesh,90jrong/libmesh,libMesh/libmesh,vikramvgarg/libmesh,coreymbryant/libmesh,roystgnr/libmesh,benkirk/libmesh,libMesh/libmesh,dschwen/libmesh,aeslaughter/libmesh,svallaghe/libmesh,pbauman/libmesh,balborian/libmesh,BalticPinguin/libmesh,balborian/libmesh,jwpeterson/libmesh,vikramvgarg/libmesh,vikramvgarg/libmesh,balborian/libmesh,benkirk/libmesh,benkirk/libmesh,coreymbryant/libmesh,libMesh/libmesh,hrittich/libmesh,roystgnr/libmesh,giorgiobornia/libmesh,dschwen/libmesh,coreymbryant/libmesh,aeslaughter/libmesh,hrittich/libmesh,friedmud/libmesh,svallaghe/libmesh,dschwen/libmesh,libMesh/libmesh,benkirk/libmesh,benkirk/libmesh,pbauman/libmesh,capitalaslash/libmesh,vikramvgarg/libmesh,90jrong/libmesh,coreymbryant/libmesh,dschwen/libmesh,90jrong/libmesh,hrittich/libmesh,balborian/libmesh,capitalaslash/libmesh,svallaghe/libmesh,jwpeterson/libmesh,benkirk/libmesh,dschwen/libmesh,BalticPinguin/libmesh,friedmud/libmesh,balborian/libmesh,90jrong/libmesh,jwpeterson/libmesh,giorgiobornia/libmesh,coreymbryant/libmesh,BalticPinguin/libmesh,giorgiobornia/libmesh,pbauman/libmesh,balborian/libmesh,BalticPinguin/libmesh,pbauman/libmesh,giorgiobornia/libmesh,aeslaughter/libmesh,libMesh/libmesh,90jrong/libmesh,90jrong/libmesh,roystgnr/libmesh,benkirk/libmesh,aeslaughter/libmesh,vikramvgarg/libmesh,BalticPinguin/libmesh,90jrong/libmesh,balborian/libmesh,vikramvgarg/libmesh,hrittich/libmesh,hrittich/libmesh,hrittich/libmesh,capitalaslash/libmesh,90jrong/libmesh,svallaghe/libmesh,capitalaslash/libmesh,BalticPinguin/libmesh