TAPESTRY-2096: Confusing exception when autobuilding a class fails due to class visibility

Files:
modified: /tapestry/tapestry5/trunk/tapestry-ioc/src/test/java/org/apache/tapestry5/ioc/internal/util/InternalUtilsTest.java (try)
modified: /tapestry/tapestry5/trunk/tapestry-ioc/src/main/java/org/apache/tapestry5/ioc/internal/ConstructorServiceCreator.java (try)
modified: /tapestry/tapestry5/trunk/tapestry-ioc/src/main/java/org/apache/tapestry5/ioc/internal/RegistryImpl.java (try)
modified: /tapestry/tapestry5/trunk/tapestry-ioc/src/main/java/org/apache/tapestry5/ioc/internal/util/InternalUtils.java (try)