Upgraded jQuery from 1.4.2 to latest 1.11.2

* Changes : Upgraded jQuery 1.4.2 to 1.11.2
* Removed depreciated api such as `browser.msie` and `live` which is replaced by `on`
* Fixed some upgrade issues

Oh this is for something else entirely, sorry. The default clicking action is already prevented [here][1] and [here][2], so you don't need to take care of that. I wonder if deleting this particular line affects anything at all?

[1]: https://github.com/koustuvsinha/quickwiki/blob/upgrade/script.js#L26
[2]: https://github.com/koustuvsinha/quickwiki/blob/upgrade/script.js#L263