from __future__ import absolute_import

import modules of sub packages w/o reference to tulip
bugfix: KripkeStructure doesn't have actions
bugfix: KripkeStructure doesn't draw edges unless formatting defined
minor syntax changes to aid tools analyzing source code
rewrite color spec for graphs

- gradients with left/right or top/bottom color pairs supported for tikz
- weighted color mix specified by dict and automatically converted to xcolor for tikz or RGB for graphviz
- refactoring to simplify code
import pydot inline