Add circleci config with mac, windows and linux testing (#338)

- Add EMSDK_NOTTY variable which we can use on CI to prevent tty output.
- Add test.bat for windows which mirrors test.sh.
- Remove travis support

.circleci/config.yml

@@ -0,0 +1,92 @@
+version: 2.1
+
+orbs:
+  win: circleci/windows@1.0.0
+
+executors:
+  bionic:
+    docker:
+      - image: buildpack-deps:bionic
+
+jobs:
+  flake8:
+    executor: bionic
+    steps:
+      - checkout
+      - run:
+          name: install pip
+          command: |
+            apt-get update -q
+            apt-get install -q -y python-pip python3-pip
+      - run: python2 -m pip install --upgrade pip
+      - run: python3 -m pip install --upgrade pip
+      - run: python2 -m pip install flake8==3.7.8
+      - run: python3 -m pip install flake8==3.7.8
+      - run: python2 -m flake8 --show-source --statistics
+      - run: python3 -m flake8 --show-source --statistics
+  test-linux:
+    executor: bionic
+    environment:
+      EMSDK_NOTTY: "1"
+      # I don't know why circleci VMs pretent to have 36 cores but its a lie.
+      EMSDK_NUM_CORES: "4"
+    steps:
+      - checkout
+      - run:
+          name: Install debian packages
+          command: apt-get update -q && apt-get install -q -y cmake build-essential openjdk-8-jre-headless
+      - run: ./test.sh
+      - run: ./test.py
+  test-mac:
+    macos:
+      xcode: "9.0"
+    environment:
+      EMSDK_NOTTY: "1"
+      # Without this, any `brew installl` command will result in self-update of
+      # brew itself which takes more than 4 minutes.
+      HOMEBREW_NO_AUTO_UPDATE: "1"
+    steps:
+      - checkout
+      - run:
+          name: Install cmake
+          command: brew install cmake
+      - run: ./test.sh
+      # TODO(sbc): Re-enable once the upstream emscripten fix makes it into
+      # a relase: https://github.com/emscripten-core/emscripten/pull/9347
+      #- run: ./test.py
+  test-windows:
+    executor:
+      name: win/vs2019
+      shell: bash.exe
+    environment:
+      # We need python installed before we can test anytyhing.
+      # There seems to be undocument copy of python installed here. Hopefully
+      # if this disappears there will be another way of getting a re-installed
+      # version.
+      PYTHON_BIN: "C:\\Python27amd64"
+      PYTHONUNBUFFERED: "1"
+      EMSDK_NOTTY: "1"
+    steps:
+      - checkout
+      - run:
+          name: Add python to bash path
+          command: echo "export PATH=\"$PATH:/c/python27amd64/\"" >> $BASH_ENV
+      - run:
+          name: Install latest
+          shell: cmd.exe
+          command: test.bat
+      - run: python test.py
+
+workflows:
+  flake8:
+    jobs:
+      - flake8
+  test-linux:
+    jobs:
+      - test-linux
+  test-mac:
+    jobs:
+      - test-mac
+  test-windows:
+    jobs:
+      - test-windows