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
Merge pull request #1508 from zeha/remotebackend-test-no-socat

Fix remotebackend tests without socat
Merge pull request #1506 from mind04/v3.4.0

next version is 3.4.0 s/3.4/3.4.0
Merge pull request #1504 from cmouse/remotebackend-docs-correct-methods

Document correct HTTP methods used
Merge pull request #1503 from cmouse/fix-issue-1455

Fix remotebackend pipe connection-string documentation
Merge pull request #1505 from mind04/yahttp

add yahttp LICENSE and README.md to dist tarball