#3 Create abstraction for external storage

[Andre Vanha]

Some phones, like the HTC Incredible support multiple locations for the Environment.getExternalStorageDirectory method. The method will return the path to the removable SD card if inserted, or to the internal writable path when the SD card slot is no avaialble. It would be great to provide a method that could return an enumeration of all known external storage directories on a phone to allow applications to access data in any area.