Add ruby 2.2 to build matrix.
Add ruby 2.2 to build matrix.

spree-contrib/spree_editor,spree-contrib/spree_editor,elia/spree_editor,jdar/spree_admin_s3,spree-contrib/spree_editor,elia/spree_editor,mysmallidea/spree_editor,jdar/spree_admin_s3,mysmallidea/spree_editor,mysmallidea/spree_editor,jdar/spree_admin_s3,elia/spree_editor