Update TDNotificationPanel submodule
Change when starting playback the stop method is called

The stop method no longer sets the start time to 0. Also removed the unused userInfo dict from the notifications.
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Update TDNotificationPanel to latest version
Change new gradient style
Add a new media player notification IGMediaPlayerPlaybackLoading which gets posted when media starts loading and a content url variable
Redesign audio view controller #19

Removed the upper controls, volume slider and placed the progress slider where the volume slide was. Removed the swipe gesture recognizer. The buffering hud now uses TDNotificationPanel. Added new gradients to the play, skip forward and skip backward buttons and removed the bar from the skip forward and skip backward buttons. Increased the distance between the play, skip forward and skip backward buttons to stop accidental tapping.
Change the audio player view controller now gets pushed before the audio starts playing

This is so it can observe the IGMediaPlayerPlaybackLoading notification when it gets posted.