Caster update

Caster the podcasting app (although now it refers to itself as a 'mobile studio') gets a comprehensive update:

• Import and Export files in iTunes
• Import audio from your iPod library
• Allows renaming and clearing of audio clips
• Import audio from email attachments
• Set custom normalize levels
• Allows using the wave editor on the pre-recorded clips
• Allows deleting and editing of already published podcasts
• Waveform editor graph is retina-display capable now