tapping 'front camera button' while recording a video freezes the camera

camera-app needs to first call stop recording before switching to the front camera.

I think it's also acceptable to disable the switching button (for front / back camera switch).

This bug was fixed in the package camera-app - 3.0.0+14.10.20140903-0ubuntu1

---------------
camera-app (3.0.0+14.10.20140903-0ubuntu1) utopic; urgency=low

  [ Michał Sawicz ]
  * Add :any to python dependency and install the camera app module in
    app-private libdir.

  [ Ugo Riboni ]
  * Add translations inside the .desktop file (LP: #1318008)

  [ Florian Boucault ]
  * Disable mode switching while recording videos.
  * Disable camera switching while recording videos. (LP: #1358302)
  * Photo roll: more fine grained media folder monitoring as to properly
    forward deletions to the view. Workarounded a couple of Qt bugs
    related to snapMode SnapOneItem. (LP: #1355407)
  * Do not allow switching to the camera roll while recording a video.
  * Rename application from 'camera' to 'com.ubuntu.camera' to make
    state saving work again. Seamlessly transition ~/Pictures/camera and
    ~/Videos/camera to new locations. (LP: #1363112)
  * Remove the X-Ubuntu-Gettext-Domain from the .desktop file, which
    causes the click scope not to load the inline translations. (LP:
    #1325626)
  * Align snapshot with viewfinder as to assure visual continuity in the
    transition from one to the other. (LP: #1362822)
  * Added cancel button in content export mode. (LP: #1362823)
 -- Ubuntu daily release <email address hidden> Wed, 03 Sep 2014 18:52:44 +0000