Samyro

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Removed dependency on methods from prettytensor tutorial's data-management.

Cleaned up references to former name "tzara"; now "samyro" throughout.

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Supports multiple-file input to sampler (and learner).

(Now 'samyro learn [options] file1 file2 fileglob' works.)

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Python 3 support fixes (tested with 3.4).

Changed index of `<BOS>` and `<EOS>` tokens to be \\x03 `STX` and \\x04 `ETX`
since the input here is much closer to TTY behavior than traditional
word vocabularies (in which 1 and 2 are usually reserved for `<S>` and
`</S>` respectively).

Added some doc support tools to a doc extra.

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Support seed text for samyro write.

Support samyro sample, and other forms of patch generation.

Improved examples.

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Initial release.