#46 RuntimeJavaFileManager updates for Java 9+.
- Re-enable runtime Java compiler tests for JDK compiler.
- Override 'contains' method introduced in Java 9.
- Using the ECJ compiler provided by JDT still fails.
- It requires this fix.
- It also requires JDT patch I created.
- With the 2 fixes combined, all our unit tests work.
Addresses #46 (closed)