Install GCompris

Install GCompris executable and its runtimes dependencies.
Also install Qt and Qml runtime plugins.
The CMake fixup_bundle function is called to:
 - create a standalone executable bundle on OSX
 - copy GCompris dll dependencies on Windows

Add qt_helper.cmake module to ease Qt and Qml plugins installation.
Workaround fixup_bunle taking ages on Windows

For some reason (cmake bug ?), fixup_bundle on Windows takes age when giving
additional libraries. So do not fixup Qt and Qml plugins. Fixing up GCompris
seems to be enough anyway.
Adapted CMakeLists to linux
Corrected a problem between linux/osx plugins
Packaging .deb on Linux with CPack
Packaging .dmg on OSX with CPack

- customize Info.plist through MACOSX_BUNDLE_* target properties
- customize dmg background with the help of a manually created .DS_Store file
Package Linux: eventually use STGZ CPack generator
[FIX] also install QtGraphicalEffets
Copy/install translations to a subdirectory

Also copy .rcc files into the OSX bundle at build time.
Write .rcc files into a subdirectory
Corrected dmg missing Qt Framework
Hack for Qt5.3 since QtSvg is no more a cmake target
fix translations install
Put 5.3 as Qt Required version
Added mediaplayer plugin to have sounds working
click_on_letter, display the letter if the sound is not found

Added the error signal in GCAudio to let the caller catch it.
click on letter, play the voice letter in sync

Now we trig the play of the voice letter after the completion of the
message 'click on letter'. Before there was a fixed 1500ms but the
message is of variable length depending on the locale.

Extended GCAudio with the signals Error and Done.
build, fixed android build

Remains an issue in compiling copyQtAndroidData
build android, added an env variable to get the host Qt5 qmake

Now you must add a variable like this to your .bashrc:
export Qt5Host=gcc_64
export Qt5_HOST_DIR=~/Qt5.3.0/5.3/$Qt5Host
core: DownloadManager: remove incomplete files after failed downloads

Otherwise the haveLocalResource() call might report existence of
unusable files.