* Added a null check to rangy-core.js for cases when the nativeselection is null.
* Disabled select-all handling in ICE by default (can be enabled through configuration).
* Added isVisible() to the plugin internal instance
* Added findPlugin(editor:CKEditor) to the plugin top level instance
* Added a new demo page for ckeditor 4.3 (see it in action - http://www.loopindex.com/demo/index4.3.html)
Merge branch 'master' of https://github.com/loopindex/ckeditor-track-changes