Add babel and jest (#4)

* Add babel and jest

* Add travis integration

* Fix travis build command

Author: cyrilwanner

.babelrc

@@ -0,0 +1,12 @@
+{
+  "presets": [
+    ["@babel/preset-env", {
+      "targets": {
+        "node": "6"
+      }
+    }]
+  ],
+  "plugins": [
+    "@babel/plugin-proposal-object-rest-spread"
+  ]
+}

.gitignore

@@ -8,3 +8,7 @@
 # node
 node_modules
 npm-debug.log*
+
+# project
+lib
+coverage

.travis.yml

@@ -0,0 +1,12 @@
+language: node_js
+node_js:
+  - 9
+  - 8
+  - 6
+install:
+  - npm install
+  - npm install -g codecov
+script:
+  - npm run build
+  - npm test
+  - codecov