CPSound support play while loading
CPSound support play while loading

This patch allow to send 'play' message before
the sound is actually loaded (by remembering the play request
and playing the sound when loaded if needed)

this allow to do:

```objj
var sound = [[CPSound alloc] initWithContentsOfURL:aSoundURL byReference:NO];
[sound play];
```

FrankReh/cappuccino,koamac/Cappuccino,zittix/cappuccino,zittix/cappuccino,wangshijin/cappuccino,koamac/Cappuccino,zittix/cappuccino,krodelin/cappuccino,Rosch/cappuccino,tancred/cappuccino,rgv151/cappuccino,FrankReh/cappuccino,deltaprojects/cappuccino,Dogild/cappuccino,kidaa/cappuccino,AlexanderMazaletskiy/cappuccino,tolmasky/cappuccino,daboe01/cappuccino,primalmotion/cappuccino,zittix/cappuccino,dgvivero/CappCoreData,cacaodev/cappuccino,primalmotion/cappuccino,tancred/cappuccino,280north/cappuccino,Rosch/cappuccino,koamac/Cappuccino,tolmasky/cappuccino,deltaprojects/cappuccino,mrcarlberg/cappuccino,zittix/cappuccino,rgv151/cappuccino,deltaprojects/cappuccino,FrankReh/cappuccino,daboe01/cappuccino,rgv151/cappuccino,280north/cappuccino,deltaprojects/cappuccino,tolmasky/cappuccino,dgvivero/CappCoreData,koamac/Cappuccino,deltaprojects/cappuccino,daboe01/cappuccino,mrcarlberg/cappuccino,deltaprojects/cappuccino,cacaodev/cappuccino,kidaa/cappuccino,enquora/cappuccino,Dogild/cappuccino,Dogild/cappuccino,FrankReh/cappuccino,daboe01/cappuccino,enquora/cappuccino,dgvivero/CappCoreData,primalmotion/cappuccino,kidaa/cappuccino,FrankReh/cappuccino,rgv151/cappuccino,tolmasky/cappuccino,tancred/cappuccino,AlexanderMazaletskiy/cappuccino,rgv151/cappuccino,Dogild/cappuccino,FrankReh/cappuccino,cacaodev/cappuccino,mrcarlberg/cappuccino,krodelin/cappuccino,AlexanderMazaletskiy/cappuccino,Rosch/cappuccino,zittix/cappuccino,enquora/cappuccino,280north/cappuccino,kidaa/cappuccino,cappuccino/cappuccino,koamac/Cappuccino,FrankReh/cappuccino,280north/cappuccino,enquora/cappuccino,deltaprojects/cappuccino,daboe01/cappuccino,wangshijin/cappuccino,Dogild/cappuccino,Dogild/cappuccino,mrcarlberg/cappuccino,280north/cappuccino,kidaa/cappuccino,cappuccino/cappuccino,rgv151/cappuccino,rgv151/cappuccino,tancred/cappuccino,enquora/cappuccino,cacaodev/cappuccino,AlexanderMazaletskiy/cappuccino,daboe01/cappuccino,enquora/cappuccino,wangshijin/cappuccino,primalmotion/cappuccino,cappuccino/cappuccino,Rosch/cappuccino,cappuccino/cappuccino,AlexanderMazaletskiy/cappuccino,mrcarlberg/cappuccino,Dogild/cappuccino,Rosch/cappuccino,krodelin/cappuccino,Rosch/cappuccino,wangshijin/cappuccino,tolmasky/cappuccino,cacaodev/cappuccino,zittix/cappuccino,primalmotion/cappuccino,krodelin/cappuccino,AlexanderMazaletskiy/cappuccino,krodelin/cappuccino,primalmotion/cappuccino,krodelin/cappuccino,mrcarlberg/cappuccino,mrcarlberg/cappuccino,dgvivero/CappCoreData,cappuccino/cappuccino,dgvivero/CappCoreData,primalmotion/cappuccino,kidaa/cappuccino,Rosch/cappuccino,enquora/cappuccino,krodelin/cappuccino,mrcarlberg/cappuccino,daboe01/cappuccino,koamac/Cappuccino,tancred/cappuccino,cacaodev/cappuccino,FrankReh/cappuccino,wangshijin/cappuccino,cappuccino/cappuccino,wangshijin/cappuccino,cappuccino/cappuccino,tancred/cappuccino,cacaodev/cappuccino