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update config for matplotlib, because python 3.6 is required by 3.1+

for py2:
matplotlib<=2.2.3 ; python_version<"3.5"
scipy>=0.19.0, <=1.2.1 ; python_version<"3.5"
nltk>=3.2.2, <=3.4 ; python_version<"3.5"

for py3:
matplotlib ; python_version>="3.5"
scipy ; python_version>="3.5"
nltk ; python_version>="3.5"

update requests version to >=2.20.0
for CEV-2018-18074

* support avx and noavx core

* add catch and give some log

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* fix build

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* add missing package

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* fix pybind name

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* fix import error

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* conbime noavx core

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* add requirements

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* fix unkown message

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* fix api spec

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* refine and clean

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* update

* pass dist ut

* follow comments

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* refine scripts

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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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* Init slim.

* Remove distillation demo.

* Fix import errors.
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* Fix some issues.
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* Fix configs.
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* Modify API.spec.
test=develop

* Fix format.
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* Fix format.
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* Add some comments.

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* fix the numpy version has to be lower than 1.15

* Add TODO comments

Add python3 ABI to paddle_build.sh

* Build: simplify travis CI script.

* Add linkcheck and run gen_doc in host machine not in docker.

* Add LinkCheck python package.

* "add net drawer for visualizing the graph"

* "fix "

* "add dep"