Update Manifest (closes #74).

Manifest

@@ -2,7 +2,7 @@ BENCHMARKS
 CHANGELOG
 LICENSE
 Manifest
-README
+README.rdoc
 Rakefile
 TODO
 ext/extconf-make.rb
@@ -152,6 +152,7 @@ ext/libmemcached-0.32/libmemcachedutil/libmemcachedutil.ver
 ext/libmemcached-0.32/libmemcachedutil/memcached_pool.c
 ext/libmemcached-0.32/m4/ac_cxx_compile_stdcxx_0x.m4
 ext/libmemcached-0.32/m4/ac_cxx_header_stdcxx_98.m4
+ext/libmemcached-0.32/m4/aclocal.m4
 ext/libmemcached-0.32/m4/acx_pthread.m4
 ext/libmemcached-0.32/m4/byteorder.m4
 ext/libmemcached-0.32/m4/deprecated.m4