Fix man and info paths in `lightning`.

Also install `lightning.h`, which certain packages use to find it.

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

Formula/lightning.rb

@@ -2,11 +2,15 @@ require 'formula'
 
 class Lightning <Formula
   url 'http://ftp.gnu.org/gnu/lightning/lightning-1.2.tar.gz'
-  homepage 'http://www.gnu.org/software/lightning/'
   md5 'dcd2c46ee4dd5d99edd9930022ad2153'
+  homepage 'http://www.gnu.org/software/lightning/'
 
   def install
-    system "./configure", "--prefix=#{prefix}", "--disable-debug", "--disable-dependency-tracking"
+    system "./configure", "--disable-debug", "--disable-dependency-tracking",
+                          "--prefix=#{prefix}",
+                          "--mandir=#{man}",
+                          "--infodir=#{info}"
     system "make install"
+    include.install "lightning.h"
   end
 end