Improve default grails.resources.adhoc.excludes setting
- check WEB-INF anywhere in the path
- also block paths with META-INF
- block all *.class, *.properties, *.jar, *.groovy, *.gsp & *.java files
- append default excludes to existing grails.resources.adhoc.excludes setting
  by default unless grails.config.defaults.skipResourcesAdhocExcludes=true
update hibernate4 plugin version in BuildConfig.groovy example
Merge branch '2.3.x'

Conflicts:
	grails-resources/src/grails/grails-app/conf/BuildConfig.groovy