Added podspec for users to be able to link w/ CocoaPods, assumed MIT license and version 0.1.0

Hi Mo,

I'm considering using this, but I'd like to use it as a [CocoaPods](http://beta.cocoapods.org) pod versus manually linking with the project.  I've added the podspec in this pull request, but you'll need to tag the commit after merging this in using:

```shell
$ git tag -a 0.1.0 -m '0.1.0'
$ git push origin --tags
```

Two things:

1. I'm assuming that you would use an MIT license (free to use, copy, modify, etc. with no attribution necessary)
2. I'm assuming the first version of this is `0.1.0`

Please update if otherwise.

Once those are done, let me know and I can add the podspec to CocoaPod's directory of pods for you here: https://github.com/CocoaPods/Specs

This will allow users to automagically use your Zuckerkit (and link Facebook SDK in) using one line of code:

`pod 'Zuckerkit'`