Broken demo: Mod: update sticky.js to 2.9

The demo (http://demo-open-reader.tea-ebook.com/) is broken with chrome 25+.

This is just a little patch to upgrade version of sticky.js to 2.9. See https://github.com/TEA-ebook/teabook-open-reader/issues/29 for some details.

I have not tested but the difference between 2.8 and 2.9 is mainly the patch by @noplay and the other part is just an other way to access indexedDB outside global namespace.