Updating the SDK to use ARC (PLCrashReporter is still setup to not use ARC)

Also, fixing a bug where a strongly-referenced web client was causing a crash.
removing the last of the synthesizes
enabling arc in the Maps example
swapping ivars out with self dot references.
Assigning a weak reference to the delegate property. To avoid retain cycles.
better label of an internal variable (r=>redirectRequest)
Dropping support for iOS 4.3
Merge pull request #68 from AppBlade/ARC_update

Automatic Reference Counting Update