* [relay][frontend] TensorFlow saved model support

* Add Examples section

* keep one copy of tensorflow_parser in relay

* tile and repeat operator added in rely

* fix pylint

* fix make warnings

* comments addressed

* fix lint error

* comment addressed

* [Relay][Quantization] Speed-aware quantization scheme improvement

* Add comment

* Add use_stop_fusion to qconfig

* Update comment

* Improve NNVM to Relay conversion

* fix pylint

* support __lshift_scalar__, abs, ceil, floor, and trunc to pass CI

* Fix bug in mxnet converter for slick_like

* More tolerance for topi_conv2d_NCHWc

* add stack op frontend

* concate moved

* topi stack added

* stack added

* fix stack bugs and tested

* conv2d alterlayout udpated for relay

* fix pylint

* fix cmake warnings

* cmake warnings fixed

* bug fix

* trigger ci

* [RELAY][OP] Proposal

* Fix

* Fix test

* use LLVM linker

* error message improved in case of filenotfound

* linting error fixed

add test

remove dead code

stash

do it

add more test

* fix docments

* delete e

* Add slice axis op in mxnet converter

* Fix lint

* Add batch_dot and cpu schedule

* Add relay support for batch_dot

* Rename batch_dot to batch_matmul

* nits

* Add missing file

* Put batch_matmul and dense x86 schedule in separate files

* Fix pylint

* Remove unused import

* Add cuda schedule for batch_matmul

* Add test case with larger batch size

* Add batch_matmul in api doc

* Fix quantize pass rounding error

* Fix pylint and minor change

* bug fix

* Defined a common base class for TensorComputeOp and ComputeOp

* Made changes requested by @ZihengJiang

* added a testcase to assert that `tensorize` does not have any effect on TensorComputeOp ops.

* [DOCKER] Make all install .sh scripts directly executable.

* [DOCKER] Use curl -L consistently.

Make the use of the curl -L option in docker build scripts consistent.

* [DOCKER] Drop use of --force-yes

The --force-yes option is generally not recommend, it can leave
systems in an undefined state.  The use of --allow-* options is
preferred.  In this particular case the --force-yes option appears to
serve no purpose.  Dropping it.

* [DOCKER] Drop superflous repeated apt-get update.

The "apt-get update && apt-get install" idiom is necessary and
specific to Dockerfile.  In shell the repeated apt-get update is
superflous.  Drop the duplicates.

* [DOCKER] Robustness -e -u -o pipefail

The install scripts used to construct docker environments do not, in
general, propagate errors.  Some of the scripts use adhoc &&
directives to chain together short sequences of commands but there are
numerous failure modes which are silently ignored.  This patch puts in
place some consistent, basic, shell error trapping across all of the
install scripts.

Note this is a step forward towards more robust scripts but it is not
a complete solution.

* [DOCKER] Shallow clone.

Use shallow clone to reduce bandwidth requirements of repeated docker
(re)-builds.

* [DOCKER] Use clone --branch rather than clone then checkout

Use the git clone --branch idiom rather than git clone && git
checkout.  This paves the way for using --depth=1