Merge pull request #333 from arjes/master

Remove empty joins from params when an `_any` suffix is used
with a blank array.

[skip ci] until Gemfile updated to load Rails ‘4-1-stable’ instead
of ‘master’ because Rails master stopped working 4 days with
Ransack when AdequateRecord (and its major refactoring of
ActiveRecord) was merged into master.
Update Gemfile to Rails 4-1-stable instead of master

Rails master stopped working 4 days with Ransack when
Tenderlove’s AdequateRecord (and its major refactoring of
ActiveRecord) was merged into master.