* update licenses for 2019

* style

* Kill previous builds on PR update

* Remove Jenkinsfile.groovy

* Lower case method names

* Fix method notify()

* Added comment

Previous build deletion workaround to be removed as soon as better, less security vulnerable solution is found.

* Fix inconsistent stage names

* Update email notification method

- Link to pull request
- Jenkins build links to Blue Ocean

* Update prepare_environment.sh

- remove artifacts from previous build

* Added Jenkins Job No and URL

* Update prepare_environment.sh

- clone onnx models
- remove wheel build artifacts

* Link onnx models

* Update Jenkinsfile

- Only send email on fail,
- Change ONNX branch warning to info field
- Disable cloning after tox tests

* Update prepare_environment.sh

- Added comments
- link ONNX models directory

* Update cleanup

* CI speedup and simplification

* Rebuild cached master when branch build fails

* Fixed sed command

* Fixed cahced nGraph path

* Exit function if cmake or make fails

* Fixed build path

* Fail building in case cached ngraph is not built

* Ensure cached nGraph is on master before pulling

* [AIBT-446] Run nGraph-ONNX tests on nGraph PRs

* Cloning nGraph from NervanaSystems

* Updated CI path to "ngraph/.ci/onnx/jenkins"

* Updated permissions

* Fixed path in find command

* Changes to notification message

* Editing CMakeCache.txt instead of removing

* Removing old ngraph wheels; cloning pybind11 if necessary

* Fixed path in removing ngraph wheel