Add screen enhancement byobu

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

Formula/byobu.rb

@@ -0,0 +1,12 @@
+require 'formula'
+
+class Byobu <Formula
+  url 'http://launchpad.net/byobu/trunk/3.4/+download/byobu_3.4.orig.tar.gz'
+  homepage 'http://launchpad.net/byobu'
+  md5 '694c1663f178517b995ec9ca574fc463'
+
+  def install
+    system "./configure", "--prefix=#{prefix}"
+    system "make install"
+  end
+end