Adds a Feedback button to all pages so that the user can provide feedback to the site administrator. The feedback can be reviewed by the administrator under the Administration->Site Feedback menu.

TODOs:

1. Configurable positioning of some kind
2. Captcha support to avoid spam

0.2 fixes

1. Added z-order=1 for wrapper to keep form on top
2. Shrink the wrapper when form is collapsed so that it does not act like invisible div
3. Added user's mood and about selector to give more richness to feedback
4. Allow textarea to work when tinyMCE plugin is present (avoid rich textbox)
5. Auto track the URL from which feedback is provided