Use AVAudioSessionDelegate only on iOS < 6
Fix deprecations on iOS >= 6.0

Use AVAudioSessionInterruptionNotification instead of the deprecated protocol on iOS >= 6.0
Merge pull request #299 from calin-s/develop-v2

Fix deprecation warnings on iOS >= 6.0 in CocosDenshion
Merge pull request #7 from cocos2d/develop-v2

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