* rename directories to be consistent
* rename reference namespace to match directory

* Remove unnecessary Optional type annotations.

* Implement PR review changes

* cleanup neon integration documentation

* topolotical-sort based node clustering

* cmake builds

* Argon manager renamed to NNP along with placement

* nnp dir cmake changes

* tests pass

* more renames

* somemore renames

* reslove redefination

* revert to ARGON_API

* more PR comments and remove nnp-fusion tests as redundant

* update path

* fix format

* global tracing

* fix compiler errors

* nan/inf validation

* 0644 on mkldnn_utils.cpp

* address Bob's feedback

* 0755 -> 0644

* remove format changes to python dir

* add visualize option to nbench

* check for dot, amend help msg

* fix a segfault while printing shapes for multi-output ops

Updates to docs

* add python dir to check-code-format and re-run apply-code-format on it

* 0644 -> 0755

* File renaming missed in git add earlier

* More doc validation for neon install

* Typo on sphinx syntax for ordered list

* Missed a delete

* More clarity on optional steps WRT virtualenv and opt dirs

* Rendering subbullets as bullets for clarity and fix typo

* New docbuild graphic now working

* Framework intg guide updated with ngraph-neon doc improvements

Contains multiple fixes to GetOutputElement, BatchNorm, autodiff, fprop_cache to integrate multi-output batchnorm and fprop_cache 

* Remove unsupported linker flags for Mac build.

* Restructure python binding.
Put low level direct wrapper for ngraph c++ API into ngraph/impl
Move high level API from ngraph_api to ngraph

* Move CMakeLists.txt to its own PR

Doc validation, cleanup, remove stuff we are not using, etc