Intercept HDiv and HCurl, fix two extrusion tests
rearrangement of extrusion tests; some new tests
minor reordering of file
add Galerkin projection test for OPEs
rewritten scalar helmholtz convergence test (extruded mesh)
removed outdated tests
minor: fix up extruded Helmholtz test description
moved LSW 'test' to demos directory (was never really a test)
Rewrite tests to use parametrize
minor: removed obsolete line
Add minor print modifications and FIXME documentation
Add xfailed extruded VFS mass matrix test
Merge pull request #75 from firedrakeproject/extrusion-hdivcurl-proper

Change handling of tensor product vector-valued FE families.  When
building such a family, one must wrap the outer product element in HDiv
or HCurl appropriately so that FIAT knows how to pad out components.

Add reasonably thorough set of tests of basic functionality on a range
of extruded function spaces.
Bump version to 0.7.0