Update .travis.yml for PostgreSQL 9.3.7, 9.2.11, 9.1.16, 9.0.20.
Update .travis.yml for PostgreSQL 9.3.7, 9.2.11, 9.1.16, 9.0.20.

bwtakacy/pg_bulkload,bwtakacy/prev_pg_bulkload_repo,bwtakacy/prev_pg_bulkload_repo,bwtakacy/prev_pg_bulkload_repo,bwtakacy/pg_bulkload,bwtakacy/pg_bulkload