SVGOverlay: renamed NodePrototype.draw to .createGraphics.
SVGOverlay: properly position the edge line between two nodes at the back,
so that it does not interfere with mouse interactions with the node circle.
SVGOverlay: refactored code related to updateConfidenceText for clarity.
SVGOverlay: run jshint on overlay_node.js.
Ignored some suggestions regarding the use of the word 'new'
and the necessecity of using the radix parameter with parseInt.
SVGOverlay: fix error when attempting to update the SVG layer after deleting a connector arrow.
Merge branch 'master' of github.com:acardona/CATMAID