Django-base64field

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* Fixed 10: Add a custom ek generator method.
* Make `unique` attr on Base64Field optional.
* Write unit-tests for `encode_receiver`.

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- Fixed 1: Travis for testing is available now.
- Fixed 2: Some routine files such as readme, license, etc.. .
- Fixed 3: Added more tests.
- Fixed 4: Added a tiny readme.
- Fixed 5: Wrote Docstring and Doctests for ``Base64Field`` class.
- Registered, Uploaded django-base64field for PyPi.