Creating API that can be invoked programatically: Use Retrolambda.reify ...

...to remove invokeDynamic lambda based invocations from a single byte[] classfile.

I would like to embed retrolambda into my bck2brwsr ahead-of-time convertor. To do so I need to invoke it programmaticaly, not letting it write anything to disk. I am in a need of an API I could rely on to invoke such conversion. This pull request is my 1st attempt to define such API.

What do you think?