* Doc the A-ops.

* Better structure for ops and the docs around them, based on cyphers branch for doc-the-a-ops

* More edits for merge into preview branch

* Update link to framework integration guide page on testing libngraph

* Better arcbackprops, review comments

* Make ``input`` consistent.

* Uniform formatting.

* CPU: Runtime Context and Tracing

* CPU: Tracing controls

* CPU: Misc

* CPU: Restrict profiling to outermost function

* CPU: Address review comments

* Formatting fix

* unit tests faster

* speed up binary zero size tests

* fix style error

* remove some of the redundant code

* change debug enable from cmake flag to environment var so it can be changed without rebuild

* Doc for abs, update doxygen for ops with .rst doc

* Review

* WIP with test ops

* update WIP

* Add LLVM compilation detail from INSTALL to installation guide and cleanup todo comments on convolution.rst and remove deprecated file

* Clarify LLVM compilation flag on Ubuntu and delete WIP draft from earlier

fixed isnan issue on centos 7.2

MKLDNN Avg Pool Backprop kernel

* GPU kernels for reshape, GEMM, EW ADD/Mult, Maximum

(A + B) * C test now with cuBLAS
Additional gemm and gemv calls
cmake updates for cuDNN calls
memcpy wrappers in gpu_util

Additional passing tests:
aliased outputs, parameter, constant tensor memcopy

* compare derivatives from bprop and bprop with fprop cache

* code format

Fix pep8 warning in copyright

added CMAKE_OPTIONS_EXTRA

CPU: Kill warnings

* deserialize fix to return the right outermost function

* fix tests

* more switches to print out/visualize shapes

* revert to shared argon lib

* installs argon headers

* -DINSTALLED_HEADERS_PATH=${CMAKE_INSTALL_PREFIX}/include

* formatg

* remove debug info

* revert

* revert back to cpp-master

* Main chunk of style description

* Edit code guide for readability as raw rst. Update subheadings with clearer delineation

* Minor edits

* Typo

* Fix warnings in zero-sized tests; fix zero-sized tests return vector type for comparison ops

* Revert changes to cpu_emitter

* Enable CPU backprop tests

* Fix to dot codegen for cases where n_reduction_axes != 1

Dynamically create and destroy mkldnn engine objects to work around f…