Use triple_product in Pyramid5::volume().
Use triple_product in Pyramid5::volume().

Also, make the function slightly less verbose.

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