changed color to blue
Added Color and lightness variations
refine color and lightness
compute centroid (for future processing)
Merge branch 'gh-pages' of https://github.com/marcoslhc/paperjs-tutorials into gh-pages

* 'gh-pages' of https://github.com/marcoslhc/paperjs-tutorials:
  Added Color and lightness variations
  changed color to blue

Conflicts:
	js/8.js