Updated cordova.ios.js to latest 2.5.0rc1 tag
Fixes CB-571 Media updates

Add support for recording to files that do not already exist.
Return error if file extension for recoding is NOT .wav
Support Record and play back file with no path (file is created in documents/tmp dir)
When playing file with no path, first look in www dir for file, then documents/tmp
Note that <path>/fileToRecord.wav will NOT work if the path does NOT already exist