Hipo 0.4 series

    * Fixed sorting method and remove unnecessary code.
    * Use new intltool syntax.
    * Remove 'Application' category because is not valid in the freedesktop specification.
    * Make sure at least one track is selected when showing the popup menu. Fixed #412792 (Benoit Garret)
    * Set the checkout of the taglib-sharp as a svn external property.
    * Add device properties to the menu.
    * Add support for m4a files. Fixed #409097
    * Add metadata edit in the tracks view. Closes #408808 (Benoit Garret)
    * Add shadows around the playlist view and the tracks view. Closes #408806 (Benoit Garret)
    * Update list of tracks when a change is made in the properties window. Fixed #407720 (Benoit Garret)
    * Add recursive import Closes #402515. (Felipe Barros)
    * Fixed percentage calculation Closes #402536, Fixed #402940. (Felipe Barros)