Migrated to Jetty 7.x (via ring-jetty-adapter 1.1.8).

Hi James.

This obviously breaks compatibility with Jetty < 6.x. You might want to bump the major (at least minor) release number of ring-serve due to this.

If you'd rather see a pull request which supports both 7.x and 6.x of Jetty I'll be happy to do so.

Regards,
Anders