Update download_resources.py

Updated setup.py

Merge pull request #22 from FASTGenomics/return_graph

Optionally return graph object from cello_probs

Fixed bug resource location not passed to cello.predict in cello_predict

Use variable genes in PCA within clustering wrapper

Lazy loading of Cell Ontology.

Merge branch 'package_for_pypi' of https://github.com/deweylab/CellO …

…into package_for_pypi

Removed extraneous print statement

Fixed a bug mapping clusters to cells. Also output file with most-spe…

…cific cell types.

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