Gaftools

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* Updated documentation to include conda installation instructions.
* Updated documentation to include preprint link and citation text.
* :issue:`33`: Fixed error when viewing regions spanning multiple nodes.
* :issue:`32`: Fixed error when trying to extract whole chromosomes.

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* Adding :code:`find_path` subcommand to take node path information as input and outputting the sequences.
* Updated :code:`order_gfa` subcommand to output chromosome-wise graphs only with :code:`--by-chrom` flag.
* Bug fix in :code:`view` subcommand and minor changes to make it faster.
* Updated documentation.

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* Initial commit.