Add the iPhone 4 (rev A) to the device list.  The identifier for this is iPhone3,2.  This is the 8gb variant that was released as the iPhone 4 was sent downmarket.

Ref: http://theiphonewiki.com/wiki/Models
Merge pull request #4 from UnderscoreDavidSmith/master

Add the iPhone 4 (rev A) to the device list.