refactored ghostdiff/knife functions into ghostutils. code runs. work in
progress
gm image utils working
implemented fallback from graphicsmagick to imagemagick
Update README.md
added gm to package
Formatting

* 'image_refactor' of git://github.com/dwabyick/Hardy:
  added gm to package
  Update README.md
  implemented fallback from graphicsmagick to imagemagick
  gm image utils working
  refactored ghostdiff/knife functions into ghostutils. code runs. work in progress

Conflicts:
	features/step_definitions/css.js
	features/support/ghost-image-utils.js
	features/support/gm-image-utils.js
	features/support/imagetest.js