Add support for init_memory and re-allocate_memory

Add DeepCF model

Enhance test calibration script on accuracy assert

test=develop

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* First pr of paddle slim.
1. Add framework of paddle slim
2. Add filter pruning strategy
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* Rename unitest to tests.
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* Add prettytable into requirements.
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* Change in_nodes and out_nodes to odered dict.
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* Remove distillation.
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* Fix API.spec
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* Fix unitest.
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* Fix unitest in windows.
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* Fix unitest in windows.
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* Fix unitest.
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* Hide some functions.
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* Fix python import in python3.5
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* Fix compress pass.
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* Fix unitest of test_dist_ctr.
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* Enhence flops.

* use os.path.join

* Fix pickle for python3
Fix log and comments.
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* 1. Remove feed_reader in compress pass
2. Fix cache reader
3. Rename CompressPass to Compressor
4. Add comments for distiller optimizer
5. Remove unused pruner currently
6. Add some comments.
7. Change API.spec
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* Fix pruning in python3.
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* Fix unitest in python3.
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* Fix format in python3.
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* Add range op.
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* Add more unitests.
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* Fix API.spec
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* Fix API.spec
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* Fix API.spec
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add var name in optimizer

test=develop;fix docker build failed

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Add channel wise in quant pass.

* Enable INT8 Concat Kernel to improve the performance of MobileNet-SSD.
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* Optimize UT format.
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* Fix UT file address issue.
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* Refine the license year.
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* Optimize code for new API.
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* Restructure INT8 Concat kernel.
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for Checkpoint save and load

Fix concat check

add elementwise floordiv, mod

* refine parallelExecutor
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* Polish op_handle
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* Remove unnecessary op_handle
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* Fix Travis CI
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* Fix fetch bug
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* Remove WaitInputVarGenerated

* Fix OpHandleBase::Run
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* debug
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* use origin fetch_op_handle
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* Revert op_handle_base.cc
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* Polish code
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* Fix OpHandleBase::Run
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* code refine

* test CI and CE
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* fix OpHandle::Run
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* refine AllReduceOpHandle
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* Polish code
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* refine fused_all_reduce_op

* add unit test in test_parallel_executor_seresnext
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Fix topk shape check

fix squeeze shape check

Fix sequence pad 2

fix matmul shape check

* Rewrite gradient ProtoMaker for affine_channel_op to remove the Output as the input.
* Add act in Python API to make the act can be in-place by layer_help.py

remove graph visualizer tool, which can be replaced by python IrGraph draw API

Fix lod reset