add conda.yaml and .binstar.yml files

This provides hooks into an automated build process on binstar build.

We should be able to set it up so that we can do something like the following

    conda install -c USERNAME cytoolz

Where USERNAME is something like `mrocklin` or `eriknw` or `pytoolz-dev`.  And it will download and install a binary on either Linux or OS-X, no C compiler required.