started to implement hightower
refactoring and bug fixes in hightower
added project Vision
moved to md readmes
Improved mission statement
Update README.md
added GPL license information
Merge branch 'master' of github.com:chris-/LogikSim
started to implement refinement algorithms
started to add hightower to base_graphics_framework
fixed horizontal and vertical blocking unittests
refactored horiztonal and vertical cover search
added visual test cases
added paper problem one
fixed narrow cave spec
fixed cave unsolvable spec
fixed escape point loop spec
implemented second refinement, however it is really slow
improved responsiveness and consistency of mousemove event
ported to Python 3