"update setup.in"

python/setup.py.in

 from setuptools import setup
 
+
 packages=['paddle',
           'paddle.proto',
           'paddle.trainer',
@@ -18,6 +19,7 @@ setup(name='paddle',
           "numpy",
           "protobuf==${PROTOBUF_VERSION}",
           "matplotlib",
+          "rarfile"
       ],
       packages=packages,
       package_dir={