Parallel Testing

[pcjennings]

There are some issues with parallelism in Python2.7 with the adsorbate fingerprinting and maybe others. This is specific to 2.7 and does not affect Python3+.

In general I think it would be best for tests to be run with nprocs=None to pick up these errors in any code with parallelism.

TravisCI has a server for parallel testing that could be used I think. But specific tests would need to be written for this. Otherwise I think we only have access to a single core by default, so even when nprocs=None everything is still being run in serial.