Merge pull request #32 from DaveWoodCom/feature/dw-use-core-location-types

Feature/dw use core location types
Added 'distance' field to ANKPlace
Added new convenience methods to ANKLinkEntity for dealing with the URI templates feature of link entities, since you can't create an NSURL with unescaped curly braces and the server wants unescaped characters only.
Now excluding the private property from JSON output
Fix an issue with transforming NSDates (__NSDate) to a JSON compatible format
Merge branch 'refs/heads/master' into develop