fog/fog — pull request #2615 by tokengeek (2014-01-28 18:01:51+00:00)
Title: Make Coveralls opt-in

Due to looking for a value of 'false' whenever I run tests locally
without the `COVERAGE` env variable coverage is very slowly, still
calculated - it then aborts without doing anything because I'm not using
a CI setup.

This adds the setting in for Travis to opt in and should exclude
coverage work for anyone running tests locally.