Removing temporal hack for using Peter's branch.

Closing the transaction connection after a successful commit

Trying again after a small delay instead of giving up when no more connections are available.

MySQL: Trying again after a small delay instead of giving up when no more connections are available.

PostgreSQL: Trying again after a small delay instead of giving up when no more connections are available.

order to release it to the pool. Closes #108.

Issue 103 - prepareStatement() must return the generated query

Issue 57 - Provide Driver() method for SQL database transactions.

Issue 80 - Adding cache for C() and benchmarks.

prepareStatement() must return the generated query for debugging purposes even if the query contains a syntax error.