Fix profile publish plugin

[jdaugherty]

No description provided.

[jdaugherty]

When working on spring security rest's profile publish:

  No signature of method: org.grails.gradle.plugin.profiles.GrailsProfilePublishGradlePlugin.validateProjectState() is applicable for argument types: (org.gradle.api.internal.project.DefaultProject_Decorated) values: [project ':spring-security-rest-testapp-profile']

[jdaugherty]

Merging this so I can get spring-security-rest fixed. @jamesfredley I think this may be another groovy issue. The methods that are private should be found on the parent class since that method is what's invoked.