Refactored functions input to fix issues with newer express versions and improve integration. Thanks for @aldonline, @luispedro and @JasonGiedymin for their contributions. - No need to specify `context`: `foo` in `ck.render tpl, foo: 'bar'` now available as `h1 @foo`. - Locals implemented through `with` by default, hardcoded as an option. - Gone with `ck_*` locals, now all junk inside a `__ck` object.