iOS SDK 7.1 (& fix to build paths in XCode 5.1). Tor 0.2.4.21. Update readme.
Use iOS OS-layer data encryption to protect settings/bookmarks when device is locked.

Prevents easy forensics from working if device is locked with passcode.

see https://developer.apple.com/library/ios/documentation/iPhone/Conceptual/iPhoneOSProgrammingGuide/AdvancedAppTricks/AdvancedAppTricks.html#//apple_ref/doc/uid/TP40007072-CH7-SW11