.travis.yml: Add lint job

Closes #48

.coafile

@@ -0,0 +1,27 @@
+[all]
+ignore = node_modules/**, dist/**, .git/**
+
+[all.SpaceConsistencyBear]
+files = **.js, **.json, **.yml, **.yaml, **.md
+bears = SpaceConsistencyBear
+use_spaces = true
+ignore += src/gantt-chart.js
+
+[all.json]
+bears = JSONFormatBear
+files = **.json
+indent_size = 2
+
+[all.js]
+bears = ESLintBear
+eslint_config = .eslintrc.json
+files = **.js
+ignore += src/gantt-chart.js
+
+[all.markdown]
+bears = MarkdownBear
+files = **.md
+
+[all.yaml]
+bears = YAMLLintBear
+files = **.yml, **.yaml

.travis.yml

@@ -28,11 +28,27 @@ jobs:
       install: pip install moban
       script: .ci/check_moban.sh
 
+    - <<: *disable_global
+      stage: lint
+      language: python
+      python: 3.6
+      cache:
+        pip: true
+        directories:
+          - node_modules
+      before_install:
+        - export PATH=$PATH:./node_modules/.bin
+        - export NODE_PATH=$NODE_PATH:./node_modules
+      install:
+        - pip install coala-bears
+        - npm install
+      script: coala --non-interactive -V
+
 # Needed for Firefox
 before_script:
   - export DISPLAY=:99.0
   - sh -e /etc/init.d/xvfb start
-  - sleep 3 # give xvfb some time to start
+  - sleep 3  # give xvfb some time to start
 
 script:
   - npm run test
@@ -51,5 +67,5 @@ deploy:
   provider: pages
   skip_cleanup: true
   github_token: $GITHUB_TOKEN
-  on:
+  "on":
     branch: master