Disable the unstable unittest

Test parallel do with multiple input

Deepcopy ParamAttr while creating parameter.

Refine profiler and expose to Python.

Fix LoD calculate of im2seq

Add pyton wrapper for row conv operator.

Conflicts:
	python/paddle/v2/fluid/layers/nn.py
	python/paddle/v2/fluid/tests/test_layers.py

Make Parallel.Do support sparse gradients 

Use ExternalProject_Add to download and install boost.

Fix warnings in priorbox, sequence_reshape and ctc_align_op

Enhance image.py for gray image.

* Add csp.md

* update csp.md

* Adding the distributed implementation for machine translation

* re-running CI

* Updated the code style

add output to fit a line demo

neural machine translation model support beam search with while op

Change default value of drop_rate in img_conv_group to 0

Enhance lookup_table_op to support padding_idx.

Fix the arguments transfer in image.py.