Move variable marker size functionality into base ScatterPlot class
A first pass at allowing variable sized markers in a colormapped scatter plot
An example scatter plot with variable size and color symbols
Re-enable use of draw_path_at_points() method
Use bruteforce render method with variable size symbols in ColormappedScatterPlot
Update title for the view for colormapped variable sized scatter plot example
Eliminate rendundant marker rendering functions
Pass point mask to marker rendering function
Merge branch 'feature-scatterplot-merge' of https://github.com/enthought/chaco