CPU: Introduce reshape fallback before we switch to Eigen tensors

* Fix project README to be current, new doxyfile config test, cleanup static dir of theme

* make sure new README gets added

* fixes on doc cleanup branch

* Add feedback from github reviews

* Fix core README again

* test relu fusion for argon backend and enable permutation over max op

1. AvgPoolBackprop type checking
2. Padding for max-pool op and kernel
3. Max pool backprop kernel, and integrating everything with CPU backend/serializer
3a. Add optional backpointer from the max pool backprop op to the forward prop op

* modify existing autodiff unit tests to test fprop cache

* cleanup

* fix compile error introduced with bad merge

* remove invalid negative/negative backwards power test

(Squashing this commit but going to leave the full log here, unlike the way I usually do things)

* Incremental work on compatibility with system requirements

* Lower cmake version requirement so we can work with CentOS 7.4

* Disambiguate isnan call (CentOS's compiler doesn't like it)

* Make external_tbb conditional on NGRAPH_CPU_ENABLE

* Make MKLDNN inclusion conditional on NGRAPH_CPU_ENABLE

* Roll back desperation change to Ubuntu 14.04 binaries

* De-revert copyright date change (arrgh)

* Revert change of TBB's hard-coded compiler choice to gcc

* Cleanup of modified CMake stuff

* Add broken support for building LLVM from source

* Explain modification to json.hpp required compiler version

* Make TBB optional, and on by default. To disable, cmake -DNGRAPH_TBB_ENABLE=FALSE

* Add reasonable default for LLVM's CMAKE_ASM_COMPILER so users don't have to specify it

* Force TBB disabled if CMake is too old to build it (for CentOS)

* Build LLVM OpenMP as external project

* Tweak LLVM build options

* Minor comment edit in cmake scripts

* Workaround (fix?) for codegen crashes on CentOS

* Add some header paths for CentOS to resource_generator; temporary(?) tweak to ignore nonexistent paths

* Remove CMake compatibility figleaf since LLVM will require 3.1+ anyway

* Fix the TBB-enable flag to default to on

* Remove hard-coded choice of clang as tbb compiler

* ln -s -> ln -sf in command to create link for OpenMP source dir

* Make OpenMP build so it doesn't require symlink

* Allow use of prebuilt LLVM if requested at cmake time

* Some INSTALL instructions

* Allow NGRAPH_USE_PREBUILT_LLVM to be set in environment variable

* Tweak CI cmake options to use prebuilt LLVM

* Remove debug messages

* Rework defaulting behavior for LLVM_TARBALL_URL and LLVM_SHA1_HASH

* Remove warning message for unavailable header file directories

inline

Inliner pass + tests

debugging

fix inliner failures due to the fact a random function is picked as an outermost one

copyright headers

fix clone of function with multiple outputs

add robust replacement for is_functionally_identical that relies on comparing emitting functions as string (#441)

GPU ew add and mult cuBLAS calls

GPU (A + B) * C with cuBLAS

Additional gemm and gemv calls

cmake updates for cuDNN calls

kernels WIP

params for dot gemm

more kernel WIP

memcpy wrappers

aliased outputs, parameter, constant tensor memcopy

comment cleanup

remove cruft

gpu faster gemm

MNIST WIP

Cleanup

* mark convolution and pooling as non-functionally equivalent
temporary workaround for MKLDNN issue

* fix build warning

* More graph construction

* Review comments

* fix resource generator dependencies

* add cr to end of file

* simplification pass

* serializer change to test models

* some small test fixes

* addressing Scott's feedback

* missed one nn

* formatting fixes

* simplification -> reshape_elimination