Genometools

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- fixed `ensembl_extract_protein_coding_genes.py` script
- added `ncbi.taxonomy` submodule to parse taxonomy data from NCBI FTP server

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- rewrote `ensembl.get_protein_coding_genes()` function to use pandas for
parsing data, store more information about the genes (including position and
orientation), and add gene sorting feature
- added `ensembl.gdc` subpackage, which includes routines for querying the
RESTful API of the NCI's Genomic Data Commons (https:///gdc.cancer.gov)
- minor fixes

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- added docstrings in `expression` subpackage

- minor fixes

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- fix `six` version dependency issue with readthedocs

- minor fixes

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- added function `get_protein_coding_genes` to `ensembl` subpackage

- added/expanded functionality of download functions in `misc` subpackage

- minor fixes

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- added `ontology` subpackage

- minor bufixes and improvements