ai/postcss — pull request #54 by lydell (2014-06-19 13:58:51+00:00)
Title: Fix: `options.annotation` should be relative to `options.to`

If `options.annotation` is set to a path, that string is inserted
after "sourceMappingURL=". That means that the path will be relative to
the output CSS file -- in other words, relative to `options.to`.