v0.12.2

• Fix issue preventing build ("Cannot assign to read only property
  'subarray'") because of bug in uglifyjs. (#1072)

@jaridmargolin

• Fix tabbing issue (#877) on IE11. (#997)

@bwilson-ux

• Fix jQuery initialization for jQuery >= 1.9 (#1045)

@mpokrywka

• Make remove_button work for single-option usage (#848)

@ChoppyThing

• Fixed bug that made allowEmptyOption: true useless (#739)

@mcavalletto

• Functions in option render can now return a DOM node in addition to
  text. (#617)