Added travis-ci config and github readme
Ported code to pass tests for Py 2to3

- moved unit tests to package keyczar.tests
- moved keyczart to package keyczar.tool
- Added binary-only api for en/decrypt, attachedverify
- refactored backend to use streams for all en/decrypt
- refactored most of the char manipulation to bytes & bytearray
- removed cut/paste python source code
- removed circular references
Fixed issue of unpadding before verifying

in deprecated streaming code
Refactored aes code cleaner, used pylint