Correct option name.
GRADLE-2962 - Don't attempt to load filtered classes.

Previously they were loaded before deciding to filter them or not.
Make tests require Java 1.6 or better.
Relax the error message checking to deal with the different output on IBM's JDK.
Can't mock class loaders on IBM JDK.
Use <pre><tt> for example of Gradle output.
Fix code blocks in release notes.