v0.1.0

[ericnost]

Fixes #53, fixes #57, fixes #48, fixes #49, fixes #55, fixes #27, fixes #51, fixes #60, fixes #58

I'm proposing to repackage ECHO_modules as something that can be delivered through pypi (pip)

I don't think this will break much^ because the repo will still be installable as a package through pip install git+url

^ replacing state_choropleth_mapper() with choropleth() will break the missing data notebook, but I can fix that afterwards.

Other updates:

• adds aggregate_by_facility() function to support `point_mapper()
• replaces state_choropleth_mapper() with choropleth()
• expands the README
• provides a notebook full of tutorials/example code and queries
• basically incorporates useful tools from the work I did on the reorganization branch

After merging, I will set this up with pypi (#49) and also change some settings here on GitHub to automate the process of sending packages to pypi.

[shansen5]

These all look like good and important improvements to the package.