SCg-contours added
arcs to and from SCg-contours now always point to/from center of contour (without line clipping yet)
line clipping for arcs to and from SCg-contours
bug fixed: bad contours initialization
bug fixed: correct deleting of contours
bug fixed: arcs to and from contours don't stick to contour's vertexes now
Merge branch 'master' of https://github.com/deniskoronchik/scg-web.git

Conflicts:
	scg.html
	scg.js
test added
Merge pull request #16 from yalchik/master

work on issue #11
Merge branch 'master' of https://github.com/deniskoronchik/scg-web.git

Conflicts:
	scg.js
	src/scg-model-objects.js
	src/scg-render.js
	src/scg-scene.js
Added test for SCg bus