Setup Wercker SGE/non-SGE matrix builds
Setup Wercker SGE/non-SGE matrix builds

Configures CI builds of the workflow on Wercker with and without SGE.
This tests that either `dask_drmaa` or `distributed.LocalCluster` can be
used to setup the workflow and run it all the way through without
issues.

DudLab/nanshe_workflow,nanshe-org/nanshe_workflow