index.html: markup fix

fix prebind reference error

templates: close li tags

fix event prevention on chat restore

login_panel.html: remove useless quote character

Also in utils.js and otr.js (this will help reach to goal of having a private
jquery which doesn't pollute the global $ var).

index.rst: change duplicated `allow_muc` to `allow_otr`

Otherwise, we get errors "Cannot read property top of undefined".

The 0.8.2 release didn't include new builds due to an unnoticed build error.

Hebrew translation update

and one for logging out. Also added a favicon.

Elements in chat rooms are now hidden, instead of removed. Update tests to
reflect this.