This makes sure we always include all files in the repository when
disting.
Obsoletes webpack-with-stats, which had a bug anyway: it wasn't
reporting jslint errors.
This moves us one step closer to a normal source package. The sources
are now unpacked and we run "make install". We still don't build
since we don't have all the necessary tools.
Also, most importantly, the source tarball now includes our actual
sources in addition to the prebuilt binaries.
A simple Vagrant VM based on fedora 25 cloud. It syncs `dist` to
`/usr/local/share/cockpit/<dirname>` on the VM.
Also decrease the minimum required version in `manifest.json` to match
the one that's currently in fedora 25.
