Make sure we cannot find two intersections between two lines.
Make sure we cannot find two intersections between two lines.

Adresses point 2. in https://github.com/paperjs/paper.js/issues/805#issuecomment-148503018

byte-foundry/paper.js,byte-foundry/paper.js,iconexperience/paper.js,iconexperience/paper.js,lehni/paper.js,lehni/paper.js,byte-foundry/paper.js,lehni/paper.js,iconexperience/paper.js