Co-authored-by: Nicholas Ward <npward@berkeley.edu>

* Implement CanonicalSerialize/Deserialize improvements

* Improve code readability by using cursor

* Add tests for uncompressed serialization

* Improve serialization size (do not require full u64 limbs to be serialised)

* Change Flags to enum types

* Split up serialization with and without flags.

* Implement simple derive macro

* Derive traits for Groth16 and GM17 keys and proofs

* Update API of EvaluationDomain

* Update gm17 to use new API

* Move fft infrastructure to its own crate

* Fix gm17 to work with ff-fft

* Refactor polynomial infrastructure

* Change .travis-yml to not compile in release and to not run DPC tests

own crate.