Dropped node@0.8 and added node@0.12/iojs to fix Travis CI
Dropped node@0.8 and added node@0.12/iojs to fix Travis CI

uber-archive/image-diff,uber-archive/image-diff,argos-ci/image-difference,TheSisb/image-diff,twolfson/image-diff,bevacqua/image-diff-2,TheSisb/image-diff,modulexcite/image-diff,uber/image-diff,twolfson/image-diff,uber/image-diff,bevacqua/image-diff-2,modulexcite/image-diff