Use spree_core 2.3.0.beta
Use spree_core 2.3.0.beta

Fixes #26

GraphicDesk/spree_social_products,paulcc/spree_social_products,zanbee/spree_social_products,tfitts/spree_social_products,tfitts/spree_social_products,spree-contrib/spree_social_products,paulcc/spree_social_products,tfitts/spree_social_products,GraphicDesk/spree_social_products,spree-contrib/spree_social_products,zanbee/spree_social_products,GraphicDesk/spree_social_products,paulcc/spree_social_products,spree-contrib/spree_social_products