Add (ignored) test cases for Java 9 syntax related issues

[sormuras]

This PR adds file Java9SourceTest.java to show the problems with Java 9 syntax features and the new javac version included in sormuras@fee1ed2

• JDK 9 module-info.java handling #75
• Java 9 - new try-with-resources syntax not supported #155
• Java 9 - private interface methods are not supported #176

This PR also fixes a typo in TryWithResources.input and TryWithResources.output.

[sormuras]

Adding line Options.instance(context).put("-source", "9"); to com/google/googlejavaformat/java/Formatter.java:138 solves issue #176!

#75 needs more visitor love in com.google.googlejavaformat.java.JavaInputAstVisitor#visitModule
#155 needs to learn not to throw java.lang.ClassCastException: org.openjdk.tools.javac.tree.JCTree$JCIdent cannot be cast to org.openjdk.source.tree.VariableTree

[sormuras]

Superseded by #178