updated to work with rustc 90d06ec

This requires https://github.com/bjz/sax-rs/pull/3 to be complete to work.

* Updated gen to work with latest rustc. 
 * switched from `&fn` to `||`
 * removed `#[fixed_stack_segment]`
 * `split_iter` renamed to `split`
* Regenerated lib.rs based on updates