Updated to ProximityKit.framework 1.0.0.

Added NSLocationAlwaysUsageDescription key/value to PKExample-Info.plist for the benefit of iOS 8.
Changed PK prefix in symbols to RPK.
Removed unused PKViewController class.
Merge pull request #3 from RadiusNetworks/ios8_xcode6_update

Updated to ProximityKit.framework 1.0.0.