It makes $r available in the code given to CtBehavior#insertBefore().

in other words, java.lang.invoke.MethodHandles.Lookup.

Applied fix for #152 "Wrong modifiers returned for nested classes" as suggested by @pietrobraione.
Includes unit tests for all access modifiers and static.

As per question raised in #161 passing 'this' reference for CtField value new object instance.
Also added assert for testing referncing 'this' for newly added field.

With the unit tests warnings were squashed by suppressing them with SuppressWarnings annotations, instead of
reparing the issues as was done with the source. Reasons being...
 * The tests might be relying on the types as they were defined.
 * If the tests were written to test against the correct forms they would've/should've stipulated those.
 * Even unused members might be important to tests so we attempt to change as little as possible.

Changed to org.junit.Assert.

Changed to org.junit.Assert.

There were minimal changes:
Some tests had their own runners these were discontinued as IDEs/maven run the tests anyway.
Removed the main methods for these.
2 tests were dependent on the running order so added the test sorter.

All tests succeed on junit 4 with legacy support.

Move the test output folder 'runtests' to target or build directory so that mvn clean can clean that.

Due to the specification change of jigsaw, ClassLoader#defineClass()
cannot be invoked through reflection API.  As a workaround,
  --add-opens java.base/java.lang=ALL-UNNAMED
must be given to the JVM.  The ant target "runtest9" adds this jvm
argument.

LoaderClassPath is modified to show the same behavior in both Java 8 and 9.

Javassist cannot compile super.m() if m is a default method
declared in an interface.