Ffc

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- Add quadrature version of tabulate_tensor
- Add finite_element::map_{from,to}_reference_cell
- Add finite_element::{topological,geometric}_dimension
- Add dofmap::topological_dimension
- Rename num_foo_integrals --> num_foo_domains
- Rename dof_map --> dofmap
- Add finite_element::create
- Add dofmap::create

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- Rename and modify a number of UFC interface functions. See docstrings in ufc.h for details.
- Bump required SWIG version to 3.0.3
- Disable dual basis (tabulate_coordinates and evaluate_dofs) for enriched
elements until correct implementation is brought up

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- Remove FErari support
- Add support for new integral type custom_integral
- Support for new form compiler backend "uflacs", downloaded separately

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- Move to CMake build system

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- Make functions introduced in UFC 1.1 mandatory (now pure virtual)
- Update templates to allow constructor arguments in form classes

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- Changed behavior of create_foo_integral (returning 0 when integral is 0)
- Bug fixes in installation