Programmatic Scroll broken + Option for absolute scrolling missing

Hi there, thanks for this great plugin. Just updated to the new version and found out that the slimScroll({scroll:...}) option is broken. I've commited a fix and also extended the code to allow both for relative and absolute scroll commands. My use case was: scroll back to the top (after reloading via Ajax).

Hope you can use it, modify as you like.

Best regards,

Chris