fix Makefile and README.md for 2011/hamaji

Also make c2nono.pl executbale and find perl.

2011/hamaji/c2nono.pl

@@ -1,4 +1,4 @@
-#!/usr/bin/perl -n0
+#!/usr/bin/env perl -n0
 s%^ *((\d+\.)+\d+)|/$%print$1||"-","
 "%emg;s%^/.+%%ms;for$i(18..75){print/^.{$i}([\d.])/gm,"
 "}