Speeding up lint by only considering files which are different.

H/T to @sk- and https://github.com/sk-/git-lint for the
inspiration.
storage: update api version
Merge pull request #317 from silvolu/fix-storage-api-version

storage: update api version
Merge pull request #316 from dhermes/speed-up-lint

Speeding up lint by only considering files which are different.
Merge branch 'master' into dev