Default some COFFEE optimizations to on
Set default optimization level
some missing dependencies
Merge pull request #405 from firedrakeproject/build_docs_dependencies

some missing dependencies
add test for mixed Coefficient Piola transforms
Merge pull request #409 from firedrakeproject/test_piola_mixed_fn

add test for mixed Coefficient Piola transforms
missing quote
Merge pull request #408 from firedrakeproject/doc_typo

missing quote
Change coffee's modules names
Next attempt at getting the cell right.
turns out vectors are not scalars
missing subscript
Handle OuterProductElements
now with extra testing goodness
Merge pull request #404 from firedrakeproject/manifold_cell_again

* manifold_cell_again:
  now with extra testing goodness
  Handle OuterProductElements
  missing subscript
  turns out vectors are not scalars
  Next attempt at getting the cell right.
refactor reading from mesh files
add missing docstring
introduce MeshBase
selecting Mesh class is not required
introduce Mesh factory function