CI: Add Travis CI that ensures that we can build

Author: fitzgen

.travis.yml

@@ -0,0 +1,11 @@
+language: rust
+
+install:
+  - curl -o- https://raw.githubusercontent.com/creationix/nvm/v0.33.8/install.sh | bash
+  - source ~/.nvm/nvm.sh
+  - nvm install v10.5
+  - curl https://rustwasm.github.io/wasm-pack/installer/init.sh -sSf | sh -s -- -f
+
+script:
+  - npm install
+  - npm run build