Add script to plot learning curve

[ranqiu92]

No description provided.

[wangkuiyi]

Please add a copyright notice here. Something like

Paddle/python/paddle/v2/attr.py

Lines 1 to 13 in 43dab72

	# Copyright (c) 2016 PaddlePaddle Authors. All Rights Reserved
	#
	# Licensed under the Apache License, Version 2.0 (the "License");
	# you may not use this file except in compliance with the License.
	# You may obtain a copy of the License at
	#
	# http://www.apache.org/licenses/LICENSE-2.0
	#
	# Unless required by applicable law or agreed to in writing, software
	# distributed under the License is distributed on an "AS IS" BASIS,
	# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	# See the License for the specific language governing permissions and
	# limitations under the License.

[ranqiu92]

Done

[dzhwinter]

LGTM