Patch for SOCI/soci#46 to support readying bytea data in PostgreSQL
PostgreSQL test for bytea - #46. Use case of bytea to dt_string mapping is unclear, so it needs to be confirmed if the ida is to allow the semantic as presented in the test_bytea() that data != (bin1 == bin1).
Merge remote-tracking branch 'upstream/master'
travis.yml installs Firebird (issue #64)