added podspec with sample project (issue #1)

@jaredsinclair 

You just need to tag the commit with 0.0.1 and publish it on CocoaPods. In order to lint a spec you need a sample project which compiles so I created one. And I have some fun with it.

http://guides.cocoapods.org/making/making-a-cocoapod.html

![jtsreachability screenshot](https://cloud.githubusercontent.com/assets/277419/3786692/678405b6-19e0-11e4-98f2-4a16f6a7a5d1.png)