Test PR. Having issues with running tests locally

Could be a problem with my local install; want to see if Travis will pass
this. This is the current choderalab/master, plus an empty file, so if it
doesn't pass the tests then the question becomes version numbers and such.
Maybe this gives us msmbuilder.metrics?
Removing empty tmp file
Merge pull request #93 from dwhswenson/master

Test PR. Fixes problem with Travis conda requirements