Add test for Matrix(x, y) ctor static assert added in previous changeset
Add test for Matrix(x, y) ctor static assert added in previous changeset

cjntaylor/eigen,pthulhu/eigen,pthulhu/eigen,pthulhu/eigen,pthulhu/eigen,cjntaylor/eigen,pthulhu/eigen,cjntaylor/eigen,cjntaylor/eigen