Ensure response is committed after ErrorPageFilter

Otherwise Tomcat will go ahead and uncommit it and handle it again
in the ErrorReportValve (duh!)

Fixes gh-684
Clarify usage of run.arguments with Maven plugin
Add auto-configuration for @EnableHypermediaSupport

If Spring HATEOAS is on the class path, then @EnableHypermediaSupport
will be auto-configured with HAL support.