git-multipush: update to 2.3 and add HEAD

Signed-off-by: Jack Nagel <jacknagel@gmail.com>

Formula/git-multipush.rb

@@ -1,14 +1,21 @@
 require 'formula'
 
 class GitMultipush < Formula
-  url 'http://git-multipush.googlecode.com/files/git-multipush-1.0.tar.bz2'
+  url 'http://git-multipush.googlecode.com/files/git-multipush-2.3.tar.bz2'
   homepage 'http://code.google.com/p/git-multipush/'
-  md5 'ca809d24857c5abe92f870f3a4f2ebe5'
+  sha1 'a53f171af5e794afe9b1de6ccd9bd0661db6fd91'
+  head 'https://github.com/gavinbeatty/git-multipush.git', :sha => 'HEAD'
 
+  depends_on 'asciidoc' => :build if ARGV.build_head?
   # Not depending on git because people might have it
   # installed through another means
 
   def install
+    if ARGV.build_head?
+      ENV['GIT_DIR'] = cached_download+'.git'
+      inreplace 'make/gen-version.mk', '.git', '$(GIT_DIR)'
+      system "make"
+    end
     system "make", "prefix=#{prefix}", "install"
   end
 end