Report that go is not installed on non dpkg-based distros.

This allows building Go packages on distros that aren't Debian
derivatives (e.g. Arch), for later distribution to Ubuntu servers.
gofmt.
Since Go 1.2.2 tarballs are listed in the wiki.
New v1 structure.
README: mention the pre-built binaries
Use xmlpath from gopkg.in/xmlpath.v1.
Fixed typo
Merge pull request #4 from sgerrand/typo-actionCommand

Fixed typo in actionCommand
update to reflect new download page golang.org/dl/
Merge pull request #5 from andys/golang-dl-url

update to reflect new download page golang.org/dl/
main: remove wiki from tarballSources

There aren't any tarballs in this URL anymore.
Merge pull request #6 from fsouza/v1

Wiki was dropped by upstream.
Merge pull request #1 from danderson/master

Let `godeb download` work on non-dpkg distros.
Merge branch 'master' into v1.
golang.org/dl/ changed the storage location again.
Merge remote-tracking branch 'neimeyer/v1'