Merge pull request #41 from dshusta/base64

Deprecate PCK's base64 encoding and pass through to Apple's built-in methods
Merge pull request #42 from dshusta/project_warnings

Updated project settings

- Foundation
- CoreLocation
Updated readme

- Updated installation instructions for clarity
- Removed base64 encoding from list of functionality
- Called out SpecHelperStubs as a separate section from SpecHelper
- Includes some examples