Basic drawing stuff
Introduction `Drawing` object
implement CloneDrawingWand
implment ClearDrawingWand
implement basic drawing features
fix for draw_text test
Merge pull request #64 from kkung/drawing

Drawing
Coding style
Remove Drawing.drawing_wand property
Coding style
Remove __slots__ for Drawing
Add typecheck for Drawing.draw() method
Encode only if body is unicode (Drawing.text)
Convert all arguments into integers
Rename parameter drawing_wand to drawing
Make Drawing object callable
Documentation
Changelog
Drawing guide
Rename TEXT_GRAVITY_TYPES to GRAVITY_TYPES