Add travis and npmignore

.npmignore

@@ -0,0 +1,6 @@
+.DS_Store
+node_modules/
+tmp/
+*.log
+.travis.yml
+.snyk

.travis.yml

@@ -0,0 +1,17 @@
+language: node_js
+node_js:
+  - "node" # latest stable Node.js release
+
+cache:
+  directories:
+    - "node_modules" # cache the modules for faster build
+
+script:
+  - npm install -g snyk hexo-cli
+  - npm install # install node modules
+  - snyk auth $SNYK_TOKEN
+  - snyk test # Check node modules for vulnerability
+
+branches:
+  only:
+    - master # this job will affect only the 'master' branch