Add Sketchtool v.latest

Sketchtool enables cmdline export for Sketch files.
packer 0.6.0

Closes #95.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>
packer: add a test

Closes #85.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>
Consul 0.2.0

Closes #94.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>
exercism 1.6.0

Closes #99.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>
Adding SketchTool

Changing to use head as requested.
Merge branch 'master' of git://github.com/homebrew/homebrew-binary