removePaginationEvents() fix

This threw an error on my site when the pagers didn't exist. The pagers.length property couldn't be found.
Merge pull request #650 from TatumCreative/master

removePaginationEvents() fix
Loop + pagers + autoplay fix
Fix .data() setter when value = 0
Prevent keyboard control with pressed metakeys
Add enable and disable KeyboardControl functions to API
Merge pull request #659 from daleknauss/master

Add enable and disable KeyboardControl functions to API
Automatically rewritten for npm.