Problem with asset load_path when used with ZURB Foundation

As I reported here http://stackoverflow.com/questions/18416052/zurb-foundation-gem-not-added-to-asset-path-in-existing-rails-3-2-application, including mongomapper-versioned in a Rails 3.2.14 app prevents ZURB Foundation's javascript from loading

Including mongomapper-versioned in the Gemfile causes the problem, removing it from the Gemfile resolves it.
