Ignore errors fetching tiles and replace the bad tile with grey
add support for drawing paths! also maps can be generated with a POST request
add remote marker image support by specifying a full URL to an icon
auto-calculate zoom level to fit all markers
automatically shrink markers if image is smaller than 120px. draw the path using imagemagick so the line looks better.
Merge pull request #1 from aaronpk/master

Supports drawing paths, and custom marker icons