Merge pull request #1 from dizzzz/develop

Add support HTTP proxy
Update README.md
Merge pull request #3 from dizzzz/develop

Reworking the module
Fixing exception messages where {0} variables were not expanded and rangeUpperBound check and handling.
Adding onlyShape to configuration to disable line drawing for CategoryPlot to look like a scatterplot.
Change prefix to content instead of jfreechart to match expath package location and avoid warning of old style content directory.
Merge pull request #5 from ljo/develop

JFreeChart package and configuration fixes