Merge pull request python-visualization#1015 from ocefpaf/firefox_hea… …dless Use firefox headless instead of phantomjs

Merge pull request python-visualization#930 from ocefpaf/minor_cleanups Minor cleanups

Merge pull request python-visualization#720 from ocefpaf/Draw add Draw plugin

Merge pull request python-visualization#707 from ocefpaf/fix_bug_tile… …layer Fix bug `TileLayer` and `WmsTileLayer` docstrings

Merge pull request python-visualization#596 from ocefpaf/new_release New release

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.