Bug 910446: Handle duration changes in Music app

With the landing of bug 831224, the duration of MP3 files is
computed while they are playing, and updated accordingly. If
this happens, we distribute a 'durationchange' event to the
related apps.

With this patch, we handle 'durationchange' in the Music app.
All we have to do is to update the displayed duration and ensure
that the end timeout triggers at the end of the track.

Signed-off-by: Thomas Zimmermann <tdz@users.sourceforge.net>
Bug 900870 - Register to onpairedstatuschanged and remove bluetooth-pairedstatuschanged system message
Bug 825913 - Integrate code coverage library in the test agent
Bug 911709 - [MMS] missing l10n entity
Bug 907672 - [HD][Settings] Locked Wifi Connection icon jumps
Bug 907729 - [HD][FTU] Locked Wifi Icons Jump when connecting
Bug 912060 - Better and more tested call screen toggling
Bug 912184: use require() to load shared/js files
Bug 909374 - [Video] Improve view activity saving feature robustness
Bug 911669 - [B2G][Helix][Camera][ouyangming] The flash's state is different between the android device when do the same operation
Bug 907941 - gaia-ui-tests-pushbot (see bug)
Revert "Bug 906756 - Algorithms for merging givenName and familyName changed."

This reverts commit 9e737ce855b02ab60a9ab8b87f6a1d6ffa1a191c.
Merge pull request #11892 from pivanov/bug-907729

Bug 907729 - [HD][FTU] Locked Wifi Icons Jump when connecting r=samjoch
Merge pull request #11891 from pivanov/bug-907672

Bug 907672 - [HD][Settings] Locked Wifi Connection icon jumps r=samjoch
Bug 907941 - gaia-ui-tests-pushbot (see bug)
Bug 891743 - Add voice privacy mode for CDMA
Merge pull request #11715 from crh0716/891743

Bug 891743 - Add voice privacy mode for CDMA r=evelyn
Bug 907941 - gaia-ui-tests-pushbot (see bug)
Bug 893800 - Add a way to insert an app on a given position
Bug 902497 - [sms][mms] use the new asynchronous getSegmentInfoText from bug 903403 for updateSmsSegmentLimit r=schung

* we don't call getSegmentInfoForText more than once every 500ms
* getSegmentInfoForText is now asynchronous and the new code is handling this
* we now do the composeForm dataset type change in ThreadUI. As a result, the
  "type" event, sent by Compose, is not cancelable anymore, because we don't use
  this anymore.