Conflicts:
	library/LocalRegions/HexExp.cpp

Substitution of Riemann ExactSolver with Riemann ExactToroSolver. Modification of regression test accordingely.

Tidied up 2D MultiplyByQuadratureMetric calls.

Removed code duplication in MultiplyByQuadratureMetric routine.

Corrected mistake with isentropic vortex exact solution.
Fixed issue where wrong number of points being used in boundary conditions.
Added ExactSolverToro to implement Toro's exact Riemann solver.
Corrected various Riemann solvers to enable correct 3D calculation.
Modifications to library, 3D parallel advection now working but needs testing.