Top-level POM: set versions in prep for release.
Checkout latest releases of all modules.

Done with
  git co rel-app-1.0 app/
  git co rel-module1-1.0 module1/
  git co rel-module2-1.1 module2/
Add a README -- vital for release!

This README must be brought back into the trunk...
Merge README from branch 'rel' into develop

Get only the README; ignore all other changes.