Port to JSR-269
More appropriate name for annotation processor implementation
Update reference in META-INF/services
Build with -proc:none

Workaround for following error message:
Bad service configuration file, or exception thrown while constructing
Processor object: javax.annotation.processing.Processor: Provider
org.kohsuke.args4j.apt.AnnotationProcessorImpl could not be
instantiated: java.lang.NullPointerException