Don't hard-code true solutions in Jacobi unit tests.
Add QCONICAL to the list of rules supported by QBase::build()
Remove redundant logic in Jacobi quadrature unit test.
Add unit tests for 2D quadrature on TRIs and 3D quadrature on TETs.
Add QCLOUGH to the list of Triangle quadrature rules to test.
Merge pull request #377 from libMesh/quadrature_unit

Add unit tests for quadrature on TRIs and TETs