New in version 0.2:
* rawCairo function for creating primitive diagrams from raw Cairo code
* line join, cap, and dashing attributes
* bouding box visualization functions for debugging
* new padding and positioning combinators
* PDF, PS, and SVG output
* experimental tree layout
* paths, polygons, bezier curves
* create diagrams from text
* render on top of arbitrary background images
* depend on colour package instead of built-in colors
* new examples: snellen, wordcloud, dragon
* emptyPath and pathConcat