Fix CI process, clean up requirements.txt

No changes to the API, just package clean-up

Support DualMaps

folium_static now supports DualMap, which allows for two maps to be placed next to each other horizontally.

Loosen Folium requirements

Per #14, there's nothing about this package that requires 0.11, so Folium >= 0.11 should be sufficient.

Add files to manifest

No functional changes to the Python code, added files to manifest to hopefully get the conda recipe to build properly

Add testing, update example for Streamlit 0.65

No code or API changes have been made, just the addition of tests and updating the example to show a custom page title

First release on PyPI

Published current work on PyPI to provide a means of soliciting feedback from greater community.