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>
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Bug 907672 - [HD][Settings] Locked Wifi Connection icon jumps
Bug 907729 - [HD][FTU] Locked Wifi Icons Jump when connecting
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Merge pull request #11903 from crdlc/bug-911875

Bug 911875 - [Homescreen] When user select icon and press home key, selected color is shown on icon
Merge pull request #11861 from alivedise/bugzilla/909255/window-disposition-activity

Bug 909255 - Remeber window disposition activity caller, r=timdream
Merge pull request #11894 from alivedise/bugzilla/802643/remove-workaround-in-email-app

Bug 802643 - Remove activity workaround in email app, r=asuth
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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