Cocoapods pod spec pull request

Supporting [Cocoapods](http://cocoapods.org/) would make it easier to use JavaScriptCore-iOS as a dependency in other projects.

If, for example, Ejecta used Cocoapods it's [podfile](http://docs.cocoapods.org/podfile.html) could look like this:

```ruby
platform :ios, '5.0'
pod 'SocketRocket', '~> 0.2.0'
pod 'JavaScriptCore-iOS', :git => 'https://github.com/phoboslab/JavaScriptCore-iOS.git', '~> 0.0.1'
```

Currently the [pod spec](http://docs.cocoapods.org/specification.html) depends on this repository having tag `0.0.1` which would need to be added after merging this to make the spec work.

As a possible next step, it would also be cool if this project could be [added](https://github.com/CocoaPods/CocoaPods/wiki/Contributing-to-the-master-repo) to the [Cocoapods master repo](https://github.com/CocoaPods/Specs).