update travis tests to both schemas and add db-xrefs.yaml checking
update travis tests to both schemas and add db-xrefs.yaml checking

hattrill/go-site,hattrill/go-site,geneontology/go-site,geneontology/go-site,geneontology/go-site,hattrill/go-site,geneontology/go-site,hattrill/go-site,hattrill/go-site,geneontology/go-site