…of other engines
… prevent duplicate migrations
This is a better solution then having to source rvm for our multi components tests on Travis CI. Travis was unable to source rvm required to switch rvm environments. It was failing with: Unknown ruby string (do not know how to handle): ruby-2.1.0. Conflicts: .travis.yml
As documented in: #17 this is a temporary fix, we should discuss if we don't want to upgrade to latest ruby.