And add test

And to python interface

Hours later...

Yet another battle with typing

It works!

* Add ability to access a single departure term in a multi-fluid model

* Bump version to dev

Closes #8

* Add Chebyshev2D departure term type

* A fully encapsulated library wrapper with C++ interface

* Refactor types.hpp to hide the big headers in a macro conditional section

Why does Catch not capture the exception?

* Split out reducing and mutants to their own headers

* Remove unused function