zone2lmdb and lmdb-backend regression tests
first baby steps to dnssec in lmdb-backend
import dnssec records in lmdb database
get NSECx direct from backend and use it for lmdb-backend
get RRSIGs direct from backend and use it for lmdb-backend
store lmdb metadata in zone record
fix NSEC in lmdb-backend
unswap ttl and IN in saxfr output
put lmdb-backend dnssec support behind lmdb-experimental-dnssec switch
Merge pull request #1450 from mind04/lmdbsec

lmdb-backend experimental presigned dnssec support, zone2lmdb and regression tests
Fixes issue #1455
Document correct HTTP methods used
add yahttp LICENSE and README.md to dist tarball
Fix remotebackend tests without socat

When socat is not installed, the testrunner would fail instead of
exiting without testing as planned.

This also adds `set -x` to the testrunner for future error diagnosis.
remove unused gpgsql-socket option and document postgres socket usage
next version is 3.4.0 s/3.4/3.4.0
WORDS_BIGENDIAN not defined on sparc Solaris 10
don't abort make on failure in travis
Merge pull request #1513 from mind04/pgsql

remove unused gpgsql-socket option and document postgres socket usage
Merge pull request #1514 from mind04/solaris

WORDS_BIGENDIAN not defined on sparc Solaris 10