Refactored packages and added initial implementation of polynomial
function composition.

- Polynomial function compositions seems to be doing the right things,
  but is not passing unit tests.

- Started working on support for generic polynomial functions other than
  over GF2
Starting release v0.0.2
Merge branch 'release/v0.0.2' into develop

* release/v0.0.2:
  Starting release v0.0.2