fix(client): re-parse docopt
fix(builder): work around 0-byte ADD layer by ignoring tar timestamps
Merge pull request #2222 from gabrtv/fix-builder-add

fix(builder): work around 0-byte ADD layer by ignoring tar timestamps
Merge pull request #2216 from bacongobbler/fix-releases-list

fix(client): re-parse docopt
fix(docs): update requirements in sync with controller
Merge pull request #2226 from mboersma/fix-docs-reqs

fix(docs): update requirements in sync with controller