appc/spec: make version a first-class required field
appc/spec: address comments
examples: remove old downloadstore example
Merge pull request #180 from jonboulle/downloadstore

examples: remove old downloadstore example
Merge pull request #177 from jonboulle/spec2

appc/spec: make version a first-class required field
appc: add version to ace manifests
Merge pull request #184 from jonboulle/fix_aci

appc: add version to ace manifests