Using system() instead of backticks creates an environment issue on Ubuntu where pg_wrapper doesn't work properly.
Since we're using system commands anyway, delegate up to the Postgres handler so we invoke the commands with the correct arguments.
Implement JDBC Postgres schema dumping and loading by delegating to the non-JDBC Postgres adapter.
Escape command arguments when using backticks. Also, normalize evaluated value between backticks and :system calls.
Merge pull request #52 from mogotest/postgres_rake_fixes

Postgres rake fixes