[WIP] Swift Demo

[keefertaylor]

High Level Overview of Change

• Use CocoaPods which is slightly easier for devs to reason about

TODO:

• Documentation
• Actually write a demo
• README

Context of Change

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Refactor (non-breaking change that only restructures code)

Before / After

Test Plan

[keefertaylor]

Cocoapods can't embed frameworks (easily) in a command line application (see: CocoaPods/CocoaPods#3707).

Abandoning this to use Carthage.