Squashed 'importmagic/' changes from a87526c..9be0121

9be0121 Make API a bit simpler. Add README.

git-subtree-dir: importmagic
git-subtree-split: 9be01212b87f51d2bdaf52384412bbf9e2aa4acd
Merge commit '629406eebc494bdffcb40ea21efe4a50ea8e3ac9'