Swift PK post getting started.

Includes getting the project and PK setup.
WIP: Added bridging header instructions.
Added implementation.

Problem as this stands is that it references the existing CocoaPod which is
prior to the namespace change from PK to RPK.  On iOS 8, this results in a
run-time warning:

objc[1927]: Class PKManager is implemented in both /System/Library/PrivateFrameworks/PlugInKit.framework/PlugInKit and /private/var/mobile/Containers/Bundle/Application/EEA746BA-574B-45DF-8A2D-68DC928FCAB4/SwiftBeacon.app/SwiftBeacon. One of the two will be used. Which one is undefined.
objc[1927]: Class PKRegion is implemented in both /System/Library/PrivateFrameworks/PhysicsKit.framework/PhysicsKit and /private/var/mobile/Containers/Bundle/Application/EEA746BA-574B-45DF-8A2D-68DC928FCAB4/SwiftBeacon.app/SwiftBeacon. One of the two will be used. Which one is undefined.

These are causing me grief, as the code that used to work (probably prior to my
iOS 8 update but after Swift became available) no longer works on my phone.
Fixed indentation that broke a code section.
Updated to use RPK namespace.
Finalized Swift-ProximityKit How To article.
Renamed post with new date.
Fixed typo.
Merge pull request #15 from RadiusNetworks/swift-pk

Swift ProximityKit example article