travis.yml: fix import errors by calling go get
fix(update/types): go fmt

fix up the formatting with go fmt
fix(new-version): use panic instead of os.Exit()

much cleaner, do this instead.
feat(new-version): read metadata and save it away

read update metadata like size and rsa signature and push it into the
API. Also introduce tests to make sure this all works.
Merge pull request #1 from philips/add-metadata-to-new-version

feat(new-version): add the ability to read a metadata file