(maint) Add fedora 20 to build defaults
Merge pull request #572 from melissaanne/maint/stable/add-f20-to-mock-list

(maint) Add fedora 20 to build defaults
(packaging) Update FACTERVERSION to 1.7.4-rc1
(maint) Add a Gemfile for acceptance testing
(packaging) Update FACTERVERSION to 1.7.4
(maint) Align acceptance/Gemfile's beaker with puppet's acceptance/Gemfile