fix ie < 9 problem, this not referencing the input object in the callbacks
Merge pull request #495 from batusai513/master

fix bug on ie < 9, this reference
using the token list's offset height (border-box height) instead of its content height in determining where to position the dropdown
Merge pull request #499 from 2is10/dropdown_position

using the token list's offset height (border-box height)...
destroy method
Merge pull request #508 from barvaz/master

add destroy method
Merge branch 'master' of git://github.com/loopj/jquery-tokeninput