Add sshguard 1.5rc4

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

Formula/sshguard.rb

@@ -0,0 +1,14 @@
+require 'formula'
+
+class Sshguard <Formula
+  url 'http://downloads.sourceforge.net/project/sshguard/sshguard/sshguard-1.5rc4/sshguard-1.5rc4.tar.bz2'
+  homepage 'http://www.sshguard.net/'
+  md5 'b25da46b0254879609faa9841a145eba'
+
+  def install
+    system "./configure", "--disable-debug", "--disable-dependency-tracking",
+                          "--prefix=#{prefix}",
+                          "--with-firewall=ipfw"
+    system "make install"
+  end
+end