Release on conda-forge

[richardotis]

It looks pretty easy to add recipes to conda-forge, so this should probably be the preferred way to release pycalphad using conda in the future. For the 0.4 release we will simultaneously release on PyPI and the richardotis conda channel as per usual, but we will also submit a new recipe for pycalphad 0.4 to conda-forge. If the process goes well, we will deprecate the richardotis channel and do all future conda releases exclusively on conda-forge.

[richardotis]

It may be necessary to ship the unit test suite in pycalphad so that an import test can be performed using conda-forge's CI infrastructure.

[richardotis]

conda-forge/staged-recipes#1195