Don't rely on bison / flex to run tests (since travis-ci doesn't have new enough versions of the tools).
Don't rely on bison / flex to run tests (since travis-ci doesn't have new enough versions of the tools).

dburkart/mail-sieve-verifier,dburkart/check-sieve,dburkart/check-sieve,dburkart/mail-sieve-verifier,dburkart/check-sieve