Hack to sync diskCacheUsage with actual disk cache usage.

For unknown reason, diskCacheInfo's diskCacheUsage
may become out-of-sync with the actual sum of all
diskCacheInfo's sizes combined. This workaround
recalculates and stores the actual disk cache usage
size every time balanceDiskUsage gets called.
Must check iOS version during run-time as opposed to compile-time.
Prevent parent project from producing multi-application bundle.

See: http://stackoverflow.com/questions/5206536/archiving-project-in-xcode-incorrectly-creates-multi-application-bundle/5318616#5318616
Remove unused attributes. Change architecture to armv6 or armv7.
Switch project to just armv7.