podspec: add OpenSSL to AppReceiptVerificator subspec

[hpique]

The podspec has a known bug which is that the AppReceiptVerificator subspec is missing the OpenSSL static library.

I don't have a lot of experience with CocoaPods so I asked how to do this in Stack Overflow. Does anyone know the answer or can submit a pull request with a fix?

Thanks!

[mrgrauel]

I believe the only possible solution is to add the static library to your repo and then add it similar to this example, but then everybody has to trust you that the library is valid.

[hpique]

Fixed in bb65856.

@angrauel I added OpenSSL as a subspec. That way you can exclude it and add you own OpenSSL build in your Podfile.