v0.1.0

• Update most dependencies so things should work more reliably with all the
  changes in the world since I first wrote this.
• Uses latest version of image_optim, which now requires pngquant for
  insanity-level PNG optimization powers.
• Drop support for Ruby 1.8.7 as it is EOL.

v0.0.2

• redo core loop to take advantage of multi-core systems.
  • on a quick test with mislav/poignant-guide on my core-i7 system, full run
    time was reduced from ~103sec -> ~45sec.
• better peg version dependencies to stand the test of time.

v0.0.1

• initial release as a gem package
• fuck it, ship it