Adding PYRAMID13 basis functions.
Adding PYRAMID13 basis functions.

Maple script used to compute these basis functions:
https://gist.github.com/jwpeterson/7853458

balborian/libmesh,vikramvgarg/libmesh,roystgnr/libmesh,giorgiobornia/libmesh,coreymbryant/libmesh,balborian/libmesh,dknez/libmesh,capitalaslash/libmesh,BalticPinguin/libmesh,hrittich/libmesh,giorgiobornia/libmesh,dmcdougall/libmesh,karpeev/libmesh,cahaynes/libmesh,aeslaughter/libmesh,90jrong/libmesh,aeslaughter/libmesh,vikramvgarg/libmesh,svallaghe/libmesh,svallaghe/libmesh,Mbewu/libmesh,dknez/libmesh,aeslaughter/libmesh,svallaghe/libmesh,coreymbryant/libmesh,balborian/libmesh,pbauman/libmesh,svallaghe/libmesh,dschwen/libmesh,BalticPinguin/libmesh,permcody/libmesh,hrittich/libmesh,capitalaslash/libmesh,coreymbryant/libmesh,benkirk/libmesh,dschwen/libmesh,karpeev/libmesh,pbauman/libmesh,svallaghe/libmesh,friedmud/libmesh,salazardetroya/libmesh,jwpeterson/libmesh,pbauman/libmesh,capitalaslash/libmesh,permcody/libmesh,salazardetroya/libmesh,BalticPinguin/libmesh,friedmud/libmesh,dmcdougall/libmesh,permcody/libmesh,jwpeterson/libmesh,roystgnr/libmesh,coreymbryant/libmesh,salazardetroya/libmesh,cahaynes/libmesh,aeslaughter/libmesh,dschwen/libmesh,dknez/libmesh,BalticPinguin/libmesh,benkirk/libmesh,dmcdougall/libmesh,aeslaughter/libmesh,cahaynes/libmesh,hrittich/libmesh,90jrong/libmesh,aeslaughter/libmesh,vikramvgarg/libmesh,pbauman/libmesh,friedmud/libmesh,aeslaughter/libmesh,roystgnr/libmesh,dmcdougall/libmesh,vikramvgarg/libmesh,salazardetroya/libmesh,jiangwen84/libmesh,90jrong/libmesh,Mbewu/libmesh,dschwen/libmesh,cahaynes/libmesh,roystgnr/libmesh,vikramvgarg/libmesh,dschwen/libmesh,dmcdougall/libmesh,BalticPinguin/libmesh,jiangwen84/libmesh,karpeev/libmesh,benkirk/libmesh,balborian/libmesh,giorgiobornia/libmesh,libMesh/libmesh,friedmud/libmesh,dschwen/libmesh,karpeev/libmesh,friedmud/libmesh,karpeev/libmesh,permcody/libmesh,dmcdougall/libmesh,jiangwen84/libmesh,libMesh/libmesh,jwpeterson/libmesh,90jrong/libmesh,benkirk/libmesh,hrittich/libmesh,vikramvgarg/libmesh,Mbewu/libmesh,giorgiobornia/libmesh,friedmud/libmesh,jwpeterson/libmesh,permcody/libmesh,balborian/libmesh,jwpeterson/libmesh,pbauman/libmesh,capitalaslash/libmesh,jiangwen84/libmesh,coreymbryant/libmesh,jiangwen84/libmesh,vikramvgarg/libmesh,pbauman/libmesh,hrittich/libmesh,BalticPinguin/libmesh,aeslaughter/libmesh,benkirk/libmesh,friedmud/libmesh,capitalaslash/libmesh,roystgnr/libmesh,90jrong/libmesh,svallaghe/libmesh,libMesh/libmesh,pbauman/libmesh,permcody/libmesh,libMesh/libmesh,BalticPinguin/libmesh,benkirk/libmesh,hrittich/libmesh,90jrong/libmesh,Mbewu/libmesh,balborian/libmesh,dknez/libmesh,BalticPinguin/libmesh,karpeev/libmesh,dmcdougall/libmesh,90jrong/libmesh,pbauman/libmesh,dknez/libmesh,libMesh/libmesh,salazardetroya/libmesh,jiangwen84/libmesh,benkirk/libmesh,capitalaslash/libmesh,dknez/libmesh,jiangwen84/libmesh,roystgnr/libmesh,balborian/libmesh,dschwen/libmesh,Mbewu/libmesh,giorgiobornia/libmesh,balborian/libmesh,dknez/libmesh,svallaghe/libmesh,hrittich/libmesh,giorgiobornia/libmesh,giorgiobornia/libmesh,capitalaslash/libmesh,roystgnr/libmesh,salazardetroya/libmesh,salazardetroya/libmesh,friedmud/libmesh,balborian/libmesh,karpeev/libmesh,balborian/libmesh,dschwen/libmesh,jwpeterson/libmesh,90jrong/libmesh,coreymbryant/libmesh,salazardetroya/libmesh,karpeev/libmesh,hrittich/libmesh,benkirk/libmesh,coreymbryant/libmesh,libMesh/libmesh,coreymbryant/libmesh,dknez/libmesh,vikramvgarg/libmesh,jwpeterson/libmesh,Mbewu/libmesh,svallaghe/libmesh,permcody/libmesh,friedmud/libmesh,benkirk/libmesh,libMesh/libmesh,aeslaughter/libmesh,Mbewu/libmesh,svallaghe/libmesh,cahaynes/libmesh,jwpeterson/libmesh,capitalaslash/libmesh,vikramvgarg/libmesh,Mbewu/libmesh,90jrong/libmesh,pbauman/libmesh,jiangwen84/libmesh,roystgnr/libmesh,Mbewu/libmesh,cahaynes/libmesh,giorgiobornia/libmesh,hrittich/libmesh,cahaynes/libmesh,permcody/libmesh,libMesh/libmesh,giorgiobornia/libmesh,dmcdougall/libmesh,cahaynes/libmesh