Adding non-free repos
Adding free repos.
repoconf: dropbox -> dropbox-repo.

Conflicts:
Removing old examples.
repoconf: Fixing appdata parsing.
repoconf: Handle activating of repo templates.
dropbox: appdata: updating url.
dropbox-repo.repo: new format for activating.
dropbox: appdata: Add summary, update screenshot url.
dropbox: desktop file: Add NotShowIn=MATE (see review request).
dropbox.repo: Add includepkgs=, formatting.
dropbox: README: typo.
dropbox: Specfile update.
make-rpm: support new release scheme.
screenshots: Add new one on activating.