Juju 1.12.0

Closes Homebrew/homebrew#21858.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>

Formula/juju.rb

@@ -0,0 +1,22 @@
+require 'formula'
+
+class Juju < Formula
+  homepage 'https://juju.ubuntu.com'
+  url "https://launchpad.net/juju-core/1.12/1.12.0/+download/juju-core_1.12.0-1.tar.gz"
+  version "1.12.0-1"
+  sha1 "b552919f5f4ed5a34885a2a6a8a4a0d7be485267"
+
+  depends_on 'go' => :build
+
+  def install
+    ENV['GOPATH'] = buildpath
+    args = %w(install launchpad.net/juju-core/cmd/juju)
+    args.insert(1, "-v") if ARGV.verbose?
+    system "go", *args
+    bin.install 'bin/juju'
+  end
+
+  def test
+    system "#{bin}/juju", "version"
+  end
+end