Allows you to specify custom selectors on a per-file basis.
Updating readme.
I’m no expert on computer science, but this probably shouldn’t fall apart when no custom selectors are specified.
Update README.md
bumped the version to 0.2 - this version will require grunt 0.4
0.2.0 rather
Merge pull request #35 from filamentgroup/custom-selectors

Custom selectors
bump version to 0.2.1 - this one contains custom selectors option
Handle unitless height and width from SVG (plus running cat.svg through svgo to make it unitless)