Extend JdbcDriver instead of reimplementing it
Remove unused classes, add missing tests, change app package name
Fix app error - stack overflow in toString
Add Robolectric tests.

Using Robolectric to run tests directly on computer, without a need for android device.
Fix prepared statement to comply with JDBC, improve SlickDroidDriver to properly override backend.
Merge pull request #1 from zbsz/jdbc

Rewrite to extend JdbcDriver instead of copying lots of its code