Update leiningen to 1.2.0

Formula/leiningen.rb

@@ -1,16 +1,22 @@
 require 'formula'
 
 class Leiningen <Formula
-  url 'http://github.com/technomancy/leiningen/tarball/1.1.0'
+  url 'http://github.com/technomancy/leiningen/tarball/1.2.0'
   head 'http://github.com/technomancy/leiningen.git', :using => :git
   homepage 'http://github.com/technomancy/leiningen'
-  md5 'f0c0ad3450c3979658aea443c560761a'
+  md5 '1d44ca19dacd67f65247c4e946c5916a'
 
   def install
-    system "bin/lein self-install"
-    prefix.install 'bin'
+    bin.install "bin/lein"
+    system "#{bin}/lein self-install"
 
     # Install the lein bash completion file
     (etc+'bash_completion.d').install 'bash_completion.bash' => 'lein-completion.bash'
   end
+
+  def caveats; <<-EOS.undent
+    Standalone jar and dependencies installed to:
+      $HOME/.m2/repository
+    EOS
+  end
 end