Adding support for PostgreSQL 9.2.0+
changes PostgreSQL 9.3 support
Minor tweak to fix ambiguity
More code for 9.2+ including a function to check PG version using integers
Changing to use new compare version function
Issue #21852: Add support for PostgreSQL 9.3
Remove unnecessary function
Add copyright
Tidying up
Merge pull request #79 from davidbeauchamp/21852

Issue #21852: Add support for PostgreSQL 9.3