Need a way to exclude tests

[mitalia]

The DataExpress project (https://github.com/cbmi/dataexpress/) needs to exclude tests that require the proprietary Oracle and SQLServer drivers when running on Travis (since these can't be made available in the environment).

This is "easily" done with ScalaTest by tagging the Oracle and SQLServer tests and passing the excluded tests to the test-only command option (see: https://github.com/cbmi/dataexpress/blob/develop/.travis.yml).

I'm unclear how to replicate this for the coveralls plugin (or even if it's possible).

[theon]

I'll do some investigation. I found out recently that scct supports test-only, so hopefully it should be pretty easy for me to update this plugin to also support it.