Build with recent Go (fix breakage on recent OSX)

v0.0.9

bump version and fix tests

v0.0.7

• Fix floating point operation issues for cases where image sizes don't divide properly (x3 is 100x100, and x1 is 33.333333)
• Fix issue for successive reruns specific for ImageSets mentioned in #5

v0.0.6

Fixed an issue with XCode 7

DX improvements

Improving developer experience with a better bladefile.

First version

Functionally happy.