Use container-based builds on TravisCI.
Use container-based builds on TravisCI.

dajohi/go-xdr,postfix/go-xdr,nullstyle/go-xdr,davecgh/go-xdr,rasky/go-xdr,postfix/go-xdr,nullstyle/go-xdr,dajohi/go-xdr,davecgh/go-xdr,rasky/go-xdr