Merge branch 'add-allow-registration-doc' of https://github.com/gbonvehi/converse.js into gbonvehi-add-allow-registration-doc

Conflicts:
	docs/CHANGES.rst

Add fullname and jid to contact's tooltip in roster

It seems title attributes are limited to 512 chars, we will have
to live with that unless a custom tooltip is used.

removes need to modify index.html all the time.

Thanks to hawkee for the tip.

Conflicts:
	sass/converse.scss

Set immediate to true when calling _.debounce

When clicking on restore button for a minimized chat, the page's hash will change to `#`. It may cause problems for web apps that listen to changes in page's hash.

When `immediate` argument of `debounce` function is not set, `ev` is null and ev.preventDefault() will not be called.