CI workflow to build plotly.py against latest plotly.js master (#1440)

* Add updateplotlyjsdev command to pull plotly.js from master
* Add `dev_build` workflow on circleci that builds plotly.py sdist and plotlywidget against latest plotly.js master.  Packages are available as artifacts of `dev_build`

Author: jonmmease

Diff for: .circleci/config.yml

@@ -383,9 +383,67 @@ jobs:
       - store_artifacts:
           path: artifacts
 
+  plotlyjs_dev_build:
+    docker:
+      - image: circleci/python:3.7-stretch-node-browsers
+        environment:
+          PLOTLY_TOX_PYTHON_37: python3.7
+          LANG: en_US.UTF-8
+
+    steps:
+      - checkout
+      - run:
+          name: Install tox
+          command: 'sudo pip install tox requests yapf pytz decorator retrying'
+      - run:
+          name: Update plotlywidget version
+          command: 'python setup.py updateplotlywidgetversion'
+      - run:
+          name: Update plotly.js to dev
+          command: 'python setup.py updateplotlyjsdev'
+      - run:
+          name: Test with tox
+          command: |
+            locale
+            tox -e py37-core -- -a '!nodev'
+          no_output_timeout: 20m
+      - run:
+          name: Commit
+          command: |
+            sudo mkdir /dist
+            git config --global user.email "[email protected]"
+            git config --global user.name "Your Name"
+            git add -A
+            git commit -m "Codegen"
+          when: always
+      - run:
+          name: Build source distribution package
+          command: |
+            python setup.py sdist
+            sudo cp dist/* /dist
+          when: always
+      - run:
+          name: npm-pack widget
+          command: |
+            cd js/
+            npm install webpack
+            npm pack
+            sudo cp ./plotlywidget* /dist
+          when: always
+      - store_artifacts:
+          path: /dist
 
 workflows:
   version: 2
+  dev_build:
+    jobs:
+      - plotlyjs_dev_build:
+          filters:
+            branches:
+              only:
+                - master
+                - bleeding_edge
+
   build:
     jobs:
 

Diff for: .gitattributes

@@ -0,0 +1 @@
+plotly/_version.py export-subst

Diff for: MANIFEST.in

@@ -2,3 +2,5 @@ include LICENSE.txt
 include README.rst
 include README.md
 include plotlywidget.json
+include versioneer.py
+include plotly/_version.py

Diff for: plotly/__init__.py

@@ -31,3 +31,7 @@
 from plotly import (plotly, dashboard_objs, graph_objs, grid_objs, tools,
                     utils, session, offline, colors, io)
 from plotly.version import __version__
+
+from ._version import get_versions
+__version__ = get_versions()['version']
+del get_versions