Switching to CircleCI (#765)

* Untested first pass at a CircleCI configuration
* Add git submodule checkout
* Check which python is being used
* activate the venv for each task?
* try building with multiple Pythons in parallel
* Turn off TravisCI by removing the config file
* Add some comments

.circleci/config.yml

@@ -0,0 +1,92 @@
+# Python CircleCI 2.0 configuration file
+#
+# Check https://circleci.com/docs/2.0/language-python/ for more details
+#
+version: 2
+
+# The configuration in this "shared" section are the things that each job will
+# have in common, and are substituted into the jobs config below. It is the
+# job definitions that specify the things that are unique to each job (like
+# the Python version to use, via the docker image name).
+shared: &shared
+    working_directory: ~/repo
+
+    steps:
+        - checkout
+        - run:
+            name: checkout submodules
+            command: |
+                git submodule sync
+                git submodule update --init --recursive
+
+        - run:
+            name: install apt packages
+            command: |
+                sudo apt-get update
+                sudo apt-get install -y libgtk2.0-dev libgtk-3-dev libjpeg-dev libtiff-dev \
+                        libsdl1.2-dev libgstreamer-plugins-base1.0-dev libnotify-dev freeglut3 \
+                        freeglut3-dev libsm-dev libwebkitgtk-dev libwebkitgtk-3.0-dev libxtst-dev \
+                        python-virtualenv
+
+        - run:
+            name: install python packages
+            command: |
+                $MAKE_VENV
+                source venv/bin/activate
+                pip install -r requirements.txt
+
+        - run:
+            name: build wxWidgets
+            command: |
+                source venv/bin/activate
+                python build.py --jobs=4 dox build_wx
+
+        - run:
+            name: build wxPython
+            command: |
+                source venv/bin/activate
+                python build.py --jobs=4 etg --nodoc sip build_py
+
+        - run:
+            name: build wheel and test install
+            command: |
+                source venv/bin/activate
+                python build.py bdist_wheel
+                python build.py install
+                python -c "import wx; print(wx.version())"
+
+
+# We use one job for each version of Python that we want to build with. Each
+# one gets its own copy of the shared config above.
+jobs:
+    "Python-2.7":
+        <<: *shared
+        docker:
+            - image: circleci/python:2.7
+        environment:
+            - MAKE_VENV: "python -m virtualenv venv"
+
+    "Python-3.5":
+        <<: *shared
+        docker:
+            - image: circleci/python:3.5
+        environment:
+            - MAKE_VENV: "python -m venv venv"
+
+    "Python-3.6":
+        <<: *shared
+        docker:
+            - image: circleci/python:3.6
+        environment:
+            - MAKE_VENV: "python -m venv venv"
+
+
+# This workflow defines the jobs that comprise the "build" task. The jobs will
+# be run in parallel.
+workflows:
+  version: 2
+  build:
+    jobs:
+      - "Python-2.7"
+      - "Python-3.5"
+      - "Python-3.6"