prepared setuptools and Makefile for release installation
fixed crossing lines z order
fixed opengraph starting point
added snapped lines
removed examples dir, test input should be used for example storage
added eps and pdf backend, added regex matching for overlays
shadows of polygons and graphs of same z_order drawn on same surface
fixed z-order attribute parsing for above and below for graphs
fixed run script to include local shaape lib
updated readme
corrected half pixel translation between arrows and lines
extended readme
removed unused image in expected images
added scale, width and height params
merged from remote
sorted out some scaling and translation errors for sharp lines
fixed arrow initialisation
added advanced examples to readme, fixed some sharp drawing issues
added changelog, added some examples to readme
moved copyright note to the bottom of readme