remove spree_heroku check in attachment definition and subclass asset vs image
remove spree_heroku check in attachment definition and subclass asset vs image

slingerbv/spree_essential_cms,ReserveBar1/spree_essential_cms,hakhanhphuc/spree_essential_cms,citrus/spree_essential_cms,citrus/spree_essential_cms,hakhanhphuc/spree_essential_cms,ReserveBar1/spree_essential_cms,hakhanhphuc/spree_essential_cms,slingerbv/spree_essential_cms,ReserveBar1/spree_essential_cms