Optimize depmap driver analysis

[johnurbanik]

What?

• add process.py which is used for depmap driver analysis
• add proxbias/notebooks/DepMap_PB_Driver_Analysis.ipynb and proxbias/notebooks/DepMap_PB_Sample.ipynb to include analysis performed and sample of how to use driver code
• add optimized versions of monte carlo simulation code that utilize numba
• add csv for cancer gene list
• reorganize repo to make things more clear
• make downloading depmap rnai data optional to speed up usage
• clean up .gitignore for public release
• update dependencies

Why?

• all code is necessary for public release or related to reviewer comments.

[review-notebook-app]

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[nathanlazar]

Thank you!

Some of the functions could use better doc strings, but I'm going to add another notebook to generate the new box & scatter plots so I can do that on that PR.
in depmap/process:

• split_models the behavior isn't really obvious from the code, so a doc string with a description would be good.
• Docstring for bootstrap_stats is just a list of parameters

[nathanlazar]

Looks great, thanks!