Debug install failure

[mdpiper]

Installing the locally built dakotathon package on Travis was failing with a cryptic message:

$ conda install -q -c csdms dakotathon --use-local
Fetching package metadata ...........
Solving package specifications: 

PackageNotFoundError: Package not found: Conda could not find '

See, e.g., https://travis-ci.org/csdms/dakota/jobs/211894313.

It seems (???) that using the conda, conda-env, and conda-build packages in the default channel are the cause of the problem. When I use the versions of these packages supplied by conda-forge, dakotathon installs without errors.

I'd prefer to use the packages in the default channel over those supplied by conda-forge. I'll open an issue to revisit (in the near future) the changes I've made in this PR and hopefully revert them.

[coveralls]

Coverage remained the same at 97.808% when pulling 1f2fd5b on mdpiper/debug-install-failure into 371f295 on master.