Addition of a connection property to set default schema (aka search path).
Better compatibility for setSchema (supports older backend versions, and take null to reset to the default)
added correct handling of EOF in PGCopyInputStream
Merge pull request #158 from romank0/ISSUE_157

added correct handling of EOF in PGCopyInputStream
Merge pull request #156 from alexismeneses/ISSUE_155

Proposed patch for issue #155