don't evaluate envs if tests using them are filtered out (resolves #76)
don't evaluate envs if tests using them are filtered out (resolves #76)

paulolieuthier/criterion,iu-parfunc/criterion,bgamari/criterion,bos/criterion,rrnewton/criterion,bos/criterion,iu-parfunc/criterion,paulolieuthier/criterion,bgamari/criterion,iu-parfunc/criterion,bos/criterion,paulolieuthier/criterion,bgamari/criterion,rrnewton/criterion,rrnewton/criterion