* Move NARs from the NixChannel controller to the Root controller and

drop the "/nix/store".  I.e. instead of

    http://hydra.nixos.org/jobset/nixpkgs/trunk/channel/latest/nar/nix/store/99djmii6l4yw9gn07zxqabh8z58pp84c-libmspack-0.0.20040308alpha.drv 

  we now have

    http://hydra.nixos.org/nar/99djmii6l4yw9gn07zxqabh8z58pp84c-libmspack-0.0.20040308alpha.drv 

  The main reason is that this is much faster, since we don't need to
  get all the channel data (which isn't used anyway for NAR
  generation).  This speeds up downloading a NAR from the Nixpkgs
  channel by > 2 seconds.

* Drop "Hydra::View::" from view names to get rid of an ugly warning.

src/lib/Hydra/View/NixManifest.pm

@@ -26,11 +26,12 @@ sub process {
         # Escape the characters that are allowed to appear in a Nix
         # path name but have special meaning in a URI.
         my $escaped = $path;
+        $escaped =~ s/^.*\///; # remove /nix/store/
         $escaped =~ s/\+/%2b/g;
         $escaped =~ s/\=/%3d/g;
         $escaped =~ s/\?/%3f/g;
         
-        my $url = $c->stash->{narBase} . $escaped;
+        my $url = $c->stash->{narBase} . "/" . $escaped;
 
         $manifest .=
             "{\n" .