Add preliminary AESCrypt.podspec file

[czak]

Hi Gurpartap
I recently used AESCrypt on a personal project and I'm using CocoaPods for managing dependencies.

I created an AESCrypt.podspec file if you're interested in getting AESCrypt into CocoaPods and maintaing it in your repo.

If you don't mind I'd also like to submit the podspec to https://github.com/CocoaPods/Specs.

Notes

• CocoaPods suggest that a library should be versioned. 0.0.1 is acceptable for a first submission. But it's preferred that you choose a version number and tag it in the repo.
  • If you do, then :tag => 'tagname' should be used instead of :commit => 'commitsha' in the podspec
  • See https://github.com/CocoaPods/Specs/wiki/%22Please-add-semantic-version-tags%22-issue-template if you're interested

[Gurpartap]

Hi czac. Let's use CommonCrypto and Base64 or NSData+Base64 pod dependencies instead of supplying our own source files which is likely to cause conflicts. I'll update the code to use those, while using git submodule for non pod installs.