Add option for passing string to JDBC URL
Set JDBC prepareThreshold to 1 in tests
Failing test
Catch and retry in the event of STALE_STATEMENT.

Fixes #33
merge nathanlws: Catch STALE_STATEMENT and retry in CLI

Merge pull request #35 from nathanlws/sql-layer-client-tools/cli-stale-statement
https://github.com/FoundationDB/sql-layer-client-tools/pull/35