typonazi

Just typos...

The only minor code changes:

* [Cluster.java#L1200](https://github.com/al3xandru/java-driver/compare/typos-2.0?expand=1#diff-3c61240d382b855ddcdc43fa82420d28L1200)
* [ControlConnection.java#L219](https://github.com/al3xandru/java-driver/compare/typos-2.0?expand=1#diff-eb34fd201fd693686e45b0857843ba1aL219)
* [Metadata.java#L130](https://github.com/al3xandru/java-driver/compare/typos-2.0?expand=1#diff-3b330424d60c62b1f6d03c95081f6297L130)
* imports in `RequestHandler`
* [Assignment.java#L30](https://github.com/al3xandru/java-driver/compare/typos-2.0?expand=1#diff-b91cdf55e48252c3d54d2a0778f41c1bL30)
* [Clause.java#L27](https://github.com/al3xandru/java-driver/compare/typos-2.0?expand=1#diff-023185874ab8698c49912112c350aed1L27)