Allow to change the JRuby compile mode

[chkal]

I'm currently running into some weird JVM segmentation fault issues when using the JRuby JIT compiler mode. Turning off the JIT compiler fixes the problem.

I think it would be useful to expose this method to the users so that they can configure the JRuby runtime for their requirements:

rewrite/transform-markup/src/main/java/org/ocpsoft/rewrite/transform/markup/impl/JRubyTransformer.java

Line 120 in e7c4ab7

protected T compileMode(CompileMode compileMode)

[chkal]

Done