Dependency bumps

Jetty has been bumped to 9.4.8.v20171121. Kotlin has been bumped to 1.2.10. There were no breaking changes in either bump.

TemplateUtil#model bugfix

The model function used to be vararg args: Any, but has been changed to vararg args: Any?. Nullables are perfectly fine for template-models.

Cleanup

Some minor code cleanup was performed, but it shouldn’t affect anyone.