Removed Helpers

Classes extended by `@Delegate` annotated fields cause problems with IDE integration because IDEA does not detect `@DelegatesTo` annotations in the delegates. Except for `StaticAnalysisPublisherContext` these classes are the helper classes. Since it is strange that the first context/closure level uses the helper classes and deeper levels don't, this pull request removes all helper classes and `StaticAnalysisPublisherContext`.

See https://groups.google.com/forum/?fromgroups#!topic/job-dsl-plugin/2-iuHl4tidI