From Pharo2, we cannot suspend system events since missing events break the image (rpackage at least should be notified).
Merge pull request #163 from demarey/master

Don't hide events to Pharo during tests...[builds green for non-Pharo-2.0 platforms](https://travis-ci.org/dalehenrich/metacello-work/builds/7359616)
Merge branch 'master' into issue_162