Collective.xmpp.chat

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- Bugfix: Contact roster heading not cleared when last contact removed.
[jcbrand]
- Bugfix: Buddy wasn't being removed from the roster if they unsubscribed.
[jcbrand]
- Bugfix: When a user has no contacts, a subscribing contact doesn't appear.
[jcbrand]
- Bugfix: Remove contact dialog not appearing (fixed by pinning
collective.js.jqueryui)
[jcbrand]

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- Bugfix: updated HISTORY.txt format remained unchanged after last egg release
[alecghica]
- Feature: added spining image and "Connecting to chat ..." info under chat panel
when the user is not (yet) binded to the jabber server
[alecghica]
- Bugfix: cleaned up unnecessary spaces, replaced tabs with spaces and
fixed line terminators
[alecghica]

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- Use setuptools-get to deploy egg.
Fixes: https://github.com/collective/collective.xmpp.chat/issues/8
[jcbrand]

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- Bugfix: updated HISTORY.txt format remained unchanged after last egg release
[alecghica]
- Bugfix: resources submodule dir was still not being included
[jcbrand]

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- Fixed MANIFEST.in to include the resources dir.
[jcbrand]

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- Added Spanish translation.
[macagua]
- Added improvements about i18n support.
[macagua]
- Fixed JS resources order, otherwise the users were "Unable to pre-bind ..."
[alecghica]
- Remove javascript and stylesheets dirs and replace with 'resources' dir which
is a git submodule pointing to the converse.js repo.
[jcbrand]
- Separate messages from different days
[jcbrand]
- Add /help command for both single and group chat. Add /clear command for
single user chat.
[jcbrand]
- Fixes for IE8
[jcbrand]