Csft

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- Rename csft.csft to csft._csft
- Use humanfriendly to display file sizes by default
- Replace --pretty with --with-raw
- Enhance test cases

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- Expose csft.csft2data function
- Add option --pretty
- Add option --top

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- Add the version option

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This is the 1st official **release** in PyPI.

- Initialize test cases
- Integrate in Travis CI

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- Drop unused index column

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- Fix problems about setup