Check whether the given file is a URL and read from the ULR if yes, otherwise use local files.
Update README.
Fix publish date.
Generate releaseID if not present after processing.
Add new canada mapping
Merge upstream.
Merge pull request #2 from florianpilz/master

Accept URLs and generate releaseID if empty
Make publisher name and publish date required.
Update TODO list.
Merge pull request #3 from florianpilz/master

Make publisher information required arguments
Merge branch 'master' into packaging