rewrite core functions
1 page can now have 2 instances
pass speed option
add complete callback
return early
implement hashChange options
trigger click fix
keyboard nav
fix keyboard navigation bug
separate tabby theme to its own file css
provide bundled style
change key event to keydown
remove default uppercase text
add exclude link
major improvement on hashChange.
fix hashChange keyboard navigation bug
prefix box-sizing and remove repetitive delcaration
code optimization
credits and more code optimization
update README and reorder default options