basic scatterplot plugin, based on visualization-line-chart in raphael
Just slapped some fixed radius circles on top of the line, variable naming/scope pretty messy

To do:
- remove extraneous line chart functions (and the line)
- remove line chart options in plugin.php
- add correct options to plugin.php
- add hover labels for points (or already built in?)
- responsive or variable circle radii
- update thumbnail
responsive dot size
Fixed multiseries colors/ support, very basic tooltips
added option to control marker size
first marker now rendered
added thumbnail, updated thumbnail css to include svg circles
scatter plot marker types added, odd cross behavior
fixed cross markers
Updating scatter plot markers. Nightmare code base, need to do some deletions, but had to modify hgue number of files (not most elegant solution? But parallel to how colors are handled)
Merge pull request #12 from washingtonpost/scatter-plot

Scatter plot