Setup ESLint (#1)

* setup eslint
* update travis scripts
* fix typo

.eslintrc

@@ -0,0 +1,3 @@
+{
+    "extends": "open-zigbee"
+}

.travis.yml

@@ -1,4 +1,8 @@
 language: node_js
 
 node_js:
-  - "lts/*"
+  - "lts/*"
+
+script:
+  - npm test
+  - npm run lint

examples/example.js

@@ -1,34 +1,29 @@
-var ccznp = require('../index.js');
+const ccznp = require('../index.js');
 
-var spCfg = {
-    path: "/dev/ttyUSB0",
+const spCfg = {
+    path: '/dev/ttyUSB0',
     options: {
         baudrate: 115200,
-        rtscts: true
-    }
+        rtscts: true,
+    },
 };
 
-ccznp.on('ready', function () {
-    ccznp.sysRequest('ping', {}, function (err, result) {
-        if (err)
-            console.log(err);
-        else
-            console.log(result);
+ccznp.on('ready', function() {
+    ccznp.sysRequest('ping', {}, function(err, result) {
+        if (err) console.log(err);
+        else console.log(result);
     });
 
-    ccznp.sysRequest('version', {}, function (err, result) {
-        if (err)
-            console.log(err);
-        else
-            console.log(result);
+    ccznp.sysRequest('version', {}, function(err, result) {
+        if (err) console.log(err);
+        else console.log(result);
     });
 });
 
 ccznp.on('AREQ', function(result) {
     console.log(result);
 });
 
-ccznp.init(spCfg, function (err) {
-    if (err)
-        console.log(err);
-});
+ccznp.init(spCfg, function(err) {
+    if (err) console.log(err);
+});