Cpp/all

 - Includes Shawn's `fix_pkcs` branch
   - PKCS#1 1.5 padding for RSA
   - Corrects zero padding of RSA key data [described here](https://groups.google.com/d/msg/keyczar-discuss/8Z3K_K5LLiU/IjgYRzyFebYJ)
 - Includes Shawn's `tolerate_string_as_ints` branch
 - Added explicit unit tests for `tolerate_string_as_ints`
 - Add cross platform interop unit tests with Java, Python2, Python3, C#, and Go data
 - Fix AES wire format for Keys above 128. (c++ would pad the IV to key length) [issue 132](https://code.google.com/p/keyczar/issues/detail?id=132)
 - Moved test data to submodule.