* Add mechanism for disabling specific backend unit tests from a manifest file.
Populate the test manifest files for CPU, GPU and INTERPRETER.

* update docs for new manifest controlled transformer unit tests

* doc updates

* test add section on transformers to graph basics

* Fix typo on abs

* Adding more background and detail for graph-building concepts unique to nGraph

* First pass at updating nGraph basics for StackOverflow kinds of questions

* Forgot to add a file

* Update for new naming and capitalization conventions

* add edits from first PR review

* More updates from PR review

* First version of nGraph Python API documentation pages.

* Remove use of (`) apostrophes since they generate Sphinx warnings.

* Fix submodule rendering in Sphinx PythonAPI docs

* Add updated index and conf py files

* Updated version of Python API doc.

* Better description for the autosummary

* FIX: Disable autogeneration of summary files in documentation.

* Remove redundant file containing duplicate information.

* Remove unused Sphinx extensions.

* (Partially) automatic generation of python API doc.

- Detailed documentation is generated automatically
- Summaries are generated automatically for all files except runtime.py
  which is parsed incorrectly.
- No additional steps required. Only run `make html`. Under the hood there
  is lunched script which generates all required files to some temporary
  directory under `/tmp/sphinx_auto_py_doc/` and copied to docs directory
  afterwards.
- Remove `autosummary_generate` from in configuration file since we use
  custom script which performs this step.

* Review update.

* Automatically generated stub files for doc.

- Added just few empty lines which has been removed during recent merge.

* Make temp memory pools static to avoid memory allocation overheads

* Initial implementation for graph control to enable caching and computation reuse

* Added sphinx documentation

* Turned off memory buffer reuse in CPU transformer to support computation reuse. Added unit test

* Change memoizable to cacheable

* Change memoizable to cacheable

* Rename variables

* First version of nGraph Python API documentation pages.

* Remove use of (`) apostrophes since they generate Sphinx warnings.

* Fix submodule rendering in Sphinx PythonAPI docs

* Add updated index and conf py files

* Updated version of Python API doc.

* Better description for the autosummary

* FIX: Disable autogeneration of summary files in documentation.

* Doc through relu, use mathtt instead of texttt in equations.

* Review comments.

Also the ONNX how to import file was tested and it was discovered
that the wheel was actually output to a different directory than
the one specified.

Temporarily remove Python API docs. We're working on a better system of generating them.

- Disable autogeneration of summary files.

* Some more op documentation

* Review comments

* First version of nGraph Python API documentation pages.

* Remove use of (`) apostrophes since they generate Sphinx warnings.

* Fix submodule rendering in Sphinx PythonAPI docs

* Add updated index and conf py files

* Updated version of Python API doc.

* Better description for the autosummary

* Fix ngraph ONNX install directions

* Remove make j from list of install commands

* Add logical-and, logical-or ops

* Restore accidentally-deleted test

* add new ops to IE backend

* CMake: Allow build target arch to be overridden

* Add DNGRAPH_TARGET_ARCH option to install docs

* remove obsolete

* change to use new Backend API

* rename parameter

* remove deprecated

* remove all legacy Backend API usage

remove deprecated files

* pull in changes from master

* fix GPU calls

* disable tests in convolution generator

* update per PR comments. Enable performance counter feature.

* update per PR comments

* fix build error

* fix conditionally compiled test :(

* BatchNorm documentation

* Fix typo, install URL

* Switch to desired BatchNorm

* WIP editing so far for review and feedback

* Add missing env var export for neon install new process

* Add modified venv setup for TF

* More edits for FW integration and landpage

* Revise from PR feedback

* More PR feedback and editing for clarity

* Minor rewording, clearer explanation

* Final pass edit

* more editing

* force backend compile() to make a copy of the graph

fix copy_with_new_args on ops that have function pointers internal

update unit test for new backend API

add unit test for multiple simulataneous backends

* move get_subdevices virtual method to Manager class

* update GPU to latest

* update call methods

* add remove_compiled_function()

* refactor Adjoints to support multi-output ops

* passing tests

* switch to generate_adjoints(deltas) and backprop_node

* remove debugging code

* fix error msg

* fix typo adjoitns

* fix comp errors in mnist_mlp

* More extensive examples of graph building.

* Review comments

* Review comments

* Review comments

* update CentOS requs

* doc link imports title of section so remove redundant word

* CentOS getting its own section for install

* don't need both http and ssh clone for centos

* don't need to be root to install ngraph

* Integrate PR comments

* Update section on CentOS install for nGraph with PR feedback

updating ngraph theme with IntelNeoSans font on headings, better OFL font for doc readability, better rendering of certain text, etc (#727)

Issue #725

* Implement PR review changes

* cleanup neon integration documentation

* 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

* 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