Jux: Added front-end hover icon to edit modules in backend with tooltip showing module position

This pull-request adds a small button in front-end over icons with link to edit in backend directly in a new window.

It also removes a restriction to edit modules by URL, which IMHO is not needed anymore, but requires testing the particular case of here but with module editng: http://joomlacode.org/gf/project/joomla/tracker/?action=TrackerItemEdit&tracker_item_id=21327

The way it's implemented, it should work fine with most templates and situations.

An image worth a thousand words (mouse did hover the "User Menu" module during screen-shot):

![frontend-module-edit-icon](https://f.cloud.github.com/assets/47402/771962/a7088206-e8f5-11e2-9bd2-86487c7b18a0.png)