Merge pull request python-visualization#410 from ocefpaf/release

v0.2.1

Prep for release

Merge pull request python-visualization#239 from ocefpaf/changelog

changelog

Merge pull request python-visualization#99 from ocefpaf/0.1.4

Bumped version.

Merge pull request python-visualization#60 from ocefpaf/version_string

Moved version string to `folium/__init__.py`.