Enabling CORS support in jQuery.
For https://github.com/openannotation/annotator/issues/435
Adding fallback css colors for all rgba() values.
For https://github.com/openannotation/annotator/issues/434
Replacing ::after with :after in css for older browsers.
For https://github.com/openannotation/annotator/issues/434
Modifying click event checks to be friendlier to older browsers.
per https://github.com/openannotation/annotator/issues/430