guide: Build and deploy the guide in Travis CI

.travis.yml

@@ -67,6 +67,19 @@ matrix:
         - |
           (cd examples/comments && sed -i 's/: "webpack-dev-server"/: "webpack"/' package.json && ./build.sh)
 
+    # Build the guide.
+    - rust: stable
+      script: (cd guide && cargo install mdbook --vers "^0.1.0" && mdbook build)
+      deploy:
+        provider: pages
+        skip-cleanup: true
+        github-token: $GITHUB_TOKEN  # Set in travis-ci.org dashboard, marked secure
+        local-dir: guide
+        keep-history: false
+        on:
+          branch: master
+
+
 
 install:
   - curl -o- https://raw.githubusercontent.com/creationix/nvm/v0.33.8/install.sh | bash