guide: Add documentation for testing with wasm-bindgen-test

guide/src/wasm-bindgen-test/continuous-integration.md

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+# Setting Up Continuous Integration with `wasm-bindgen-test`
+
+This page contains example configurations for running `wasm-bindgen-test`-based
+tests in various CI services.
+
+Is your favorite CI service missing? [Send us a pull
+request!](https://github.com/rustwasm/wasm-bindgen)
+
+## Travis CI
+
+```yaml
+language: rust
+rust: nightly
+
+addons:
+  firefox: latest
+  chrome: stable
+
+install:
+  - rustup target add wasm32-unknown-unknown
+  - cargo install wasm-bindgen-cli
+  # Install node.js with nvm.
+  - curl -o- https://raw.githubusercontent.com/creationix/nvm/v0.33.8/install.sh | bash
+  - source ~/.nvm/nvm.sh
+  - nvm install v10.5
+  # Install chromedriver.
+  - curl --retry 5 -LO https://chromedriver.storage.googleapis.com/2.41/chromedriver_linux64.zip
+  - unzip chromedriver_linux64.zip
+  # Install geckodriver.
+  - curl --retry 5 -LO https://github.com/mozilla/geckodriver/releases/download/v0.21.0/geckodriver-v0.21.0-linux64.tar.gz
+  - tar xf geckodriver-v0.21.0-linux64.tar.gz
+
+script:
+  # Test in Chrome.
+  - CHROMEDRIVER=$(pwd)/chromedriver cargo test --target wasm32-unknown-unknown
+  # Test in Firefox.
+  - GECKODRIVER=$(pwd)/geckodriver cargo test --target wasm32-unknown-unknown
+```
+
+## AppVeyor
+
+```yaml
+install:
+  - ps: Install-Product node 10
+  - appveyor-retry appveyor DownloadFile https://win.rustup.rs/ -FileName rustup-init.exe
+  - rustup-init.exe -y --default-host x86_64-pc-windows-msvc --default-toolchain nightly
+  - set PATH=%PATH%;C:\Users\appveyor\.cargo\bin
+  - rustc -V
+  - cargo -V
+  - rustup target add wasm32-unknown-unknown
+  - cargo install wasm-bindgen-cli
+
+build: false
+
+test_script:
+  # Test in Chrome. chromedriver is installed by default in appveyor.
+  - set CHROMEDRIVER=C:\Tools\WebDriver\chromedriver.exe
+  - cargo test --target wasm32-unknown-unknown
+  - set CHROMEDRIVER=
+  # Test in Firefox. geckodriver is also installed by default.
+  - set GECKODRIVER=C:\Tools\WebDriver\geckodriver.exe
+  - cargo test --target wasm32-unknown-unknown
+```