Add Fem2DRepresentation
Add Fem2DRep unit test
Fem2DRep unit test clean up
Fix FemElement2DTriangle cpplint warning (line too long)
Merge branch 'master' of git.assembla.com:OpenSurgSim into feature/fem2D
Remove unnecessary doxygen doc in Fem2DRep
Merge branch 'feature/fem2D' into 'master'

Fem2DRep

+1: Paul Novotny, Vien Tran

Merged-on: https://www.assembla.com/code/OpenSurgSim/git/merge_requests/788103