Adding a wrap_java parameter to allow disabling use of the java.sh script

Modifying DYLD_FALLBACK_LIBRARY_PATH caused problems for us, it would be nice to have the ability to use the plain java scripts.
Instead of a conditional, it's probably better to use the `ensure` parameter of the `file` resource. That way, if `wrap_java = false`, then the wrapper will get removed if it were there before.