Subspecs & Repo Reorg

This looks like a lot, but it's almost entirely rearranging, cocoapods, and changed project files.  The most important things to look at are [the podspec](#diff-132) and [the README](#diff-69).

- Bumped the podspec version to 1.1.0 (mostly to reflect the change to subspecs)
- Reorganized into subspecs (to address #15)
- Reorganized the repo and sample projects to more closely resemble the structure generated by `pod lib create`
- Changed the sample projects to use cocoapods

@vokalinteractive/ios-developers Code review?  Thoughts?