Drf-tus

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* Fixed bug that occurred when pausing uploads (https://github.com/dirkmoors/drf-tus/pull/7).

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* Make the metadata 'filename' key a setting. (https://github.com/dirkmoors/drf-tus/pull/2).
* Switch from (Positive)IntegerField to BigIntegerField for the upload_length and upload_offset fields (https://github.com/dirkmoors/drf-tus/pull/3).
* Increase Django version support up to 1.11 (https://github.com/dirkmoors/drf-tus/pull/4).
* Fix unicode errors (https://github.com/dirkmoors/drf-tus/pull/5).
* Updated travis configuration.

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* Exchanged use of `base64.encodebytes` to `base64.b64encode`.

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* Implemented `validate_filename` handler in `TusCreateMixin`.

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* Added missing migration and changed max_length to 255 for model `Upload`'s attribute `uploaded_file`.

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* Updated default behaviour of the `get_header` handler in `TusMiddleware`.