Ffc

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- Added memory cache in jit(), for preprocessed forms
- Added support for Conditional and added demo/Conditional.ufl.
- Added support for new geometric quantity Circumradius in UFL.
- Added support for new geometric quantity CellVolume in UFL.

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- Make global_dimension for Real return an int instead of double, bug 592088
- Add support for facet normal in 1D.
- Expose -feliminate_zeros for quadrature optimisations to give user more
control
- Remove return of form in compile_form
- Remove object_names argument to compile_element
- Rename ElementUnion -> EnrichedElement
- Add support for tan() and inverse trigonometric functions
- Added support for ElementUnion (i.e. span of combinations of elements)
- Added support for Bubble elements
- Added support for UFL.SpatialCoordinate.

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- Bug fix in removal of unused variables in Piola-mapped terms for tensor
representation

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- Add back support for FErari optimizations
- Bug fixes in JIT compiler

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- Updates for FIAT 0.9.0
- Updates for UFC 1.4.0 (now supporting the full interface)
- Automatic selection of representation
- Change quadrature_order --> quadrature_degree
- Split compile() --> compile_form(), compile_element()
- Major cleanup and reorganization of code (flatter directories)
- Updates for changes in UFL: Argument, Coefficient, FormData

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- Handle setting quadrature degree when it is set to None in UFL form
- Added demo: HyperElasticity.ufl