add arrangeComplete event; percentPosition option

refactor hide/reveal; require getSize v1.2.2

Proper v2.1.0 release for npm/Browserify

Add CommonJS support for Browserify/npm

add shuffle, getFilteredItemElements method

v2 public release

upgrade Outlayer v1.2, add dist/pkgd files

needsResizeLayout

fix 3d transforms check for Firefox 26

insert appends elements; sorting improvements