update italian language

- updated version of moment.js
- remove unused variables in converse.js
- fix broken link in index.html

Adicionando Tradução de palavra

Procurei pela tradução e não hávia encontrado a tradução dessa frase, por isso venho aqui propor esta melhoria.

Excessive double quote in french translation file

See here:
https://github.com/strophe/strophejs-plugins/pull/65

Message Archive Management

updates #306

Causing tests to fail on Travis.

- Don't show another spinner if one already exists.
- last_msg_date's selector was matching chat state notifications.
- Remove the spinner when errback gets called.

updates #306

updates #306

updates #306

Groupchat queries should have a "to" parameter on the IQ stanza and don't use
the "with" query option.

updates #306

Needed for ejabberd support.

updates #306

which doesn't support getting the item count of archived messages.
See here: https://xmpp.org/extensions/xep-0059.html#count

So we don't first fetch a count of archived messages instead try to fetch the
messages themselves immediately.

updates #306

Causing the chat box to not appear when a new message is received.

- Don't play a sound notification for forwarded messages.
- Bugfix. Return when no chat box returned.

updates #306

Fixes the issue where a topmost day indicator wasn't shown when doing infinite
scrolling upwards.

updates #306

This will be useful later when we want to better place messages in the right
order.

To reduce $.find queries.

updates #306

updates #306