message: Include branch in appveyor build name and fix some env vars to strings
diff: -version: 1.0.{build}
  +version: 1.0.{build}-{branch}
  image:
  - Visual Studio 2017
  - Visual Studio 2017 Preview
  - Visual Studio 2015
  - Visual Studio 2013
  environment:
  - HasVs: true
  - CMT_TESTING: 1
  + HasVs: "true"
  + CMT_TESTING: "1"
  install:
  - ps: Install-Product node 8.9.1 x64
  @@ -15,7 +15,6 @@ build_script:
  - cmd: npm run vscode:prepublish
  - cmd: scripts/prepare_test.bat
  test_script:
  -- cmd: >-
  +- cmd: |
  node --version
  -
  node ./node_modules/vscode/bin/test
  