User availibility status improvements

* store the status of users as received in the presence stanzas
* new filter to convert a status as defined in rfc3921 to something
  readable (could be used to display contacts' status in a tooltip)
* encapsulate bootsrap's dropdown plugin in the dropdown-toggle directive
  (adding the dropdown-toggle directive to a tag calls Bootstrap's dropdown
  initializer on this tag at compile time
* allow the user to change his status via a dropdown button. This works,
  but angular complains that $apply is already in progress when you try
  to change your status

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