Add ErrorHandler middleware
Add ErrorHandler middleware

lxgxiong/goa-cellar,lxgxiong/goa-cellar,goadesign/goa-cellar,raphael/goa-cellar,goadesign/goa-cellar,goadesign/goa-cellar,raphael/goa-cellar,raphael/goa-cellar,lxgxiong/goa-cellar