Bump to spree 2.4.0.beta on master
Bump to spree 2.4.0.beta on master

AgilTec/spree_variant_options,tmedford/spree_variant_options,sliaquat/spree_variant_options,sliaquat/spree_variant_options,3drobotics/spree_variant_options,vergeman/spree_variant_options,2beDigital/spree_variant_options,nebulab/spree_variant_options,sliaquat/spree_variant_options,arnie05/spree_variant_options,tmedford/spree_variant_options,vergeman/spree_variant_options,3drobotics/spree_variant_options,arnie05/spree_variant_options,sunny2601/spree_variant_options,nebulab/spree_variant_options,nebulab/spree_variant_options,tmedford/spree_variant_options,2beDigital/spree_variant_options,rbngzlv/spree_variant_options,3drobotics/spree_variant_options,arnie05/spree_variant_options,AgilTec/spree_variant_options,vergeman/spree_variant_options,AgilTec/spree_variant_options,sunny2601/spree_variant_options,2beDigital/spree_variant_options,rbngzlv/spree_variant_options,sunny2601/spree_variant_options,rbngzlv/spree_variant_options