Conda recipe for cram

[ijstokes]

This conda recipe allows cram to be built as a conda package that can become a dependency of other conda packages. It doesn't need to live in the cram source (the build recipe can be adjusted to refer to a "remote" code base), but this is typically the best way to keep it in sync. This helps cram work with the Anaconda ecosystem.

[kynan]

@ijstokes FYI, I added a conda-forge recipe for cram a few years ago: https://github.com/conda-forge/cram-feedstock