Added linting

Author: james.cryer

.editorconfig

@@ -0,0 +1,14 @@
+root = true
+
+[*]
+end_of_line = lf
+insert_final_newline = true
+indent_style = space
+indent_size = 4
+
+[*.md]
+trim_trailing_whitespace = false
+
+[{.travis.yml}]
+indent_style = space
+indent_size = 2

.eslintignore

@@ -0,0 +1,3 @@
+/node_modules
+/libs
+/demoassets

.eslintrc

@@ -0,0 +1,27 @@
+{
+    "extends": [
+        "eslint-config-es5",
+        "plugin:prettier/recommended"
+    ],
+    "parserOptions": {
+        "ecmaVersion": 2017,
+        "sourceType": "module"
+    },
+    "rules": {
+        "prettier/prettier": [
+            "error",
+            {
+                "singleQuote": true,
+                "tabWidth": "4"
+            }
+        ],
+        "no-console": "off",
+        "no-use-before-define": ["warn", { "functions": false, "classes": false, "variables": true }],
+        "func-names": ["warn", "as-needed"]
+
+    },
+    "env": {
+        "amd": true,
+        "es6": true
+    }
+}

chai-tests/main_spec.js

@@ -1,13 +1,13 @@
-var resemble = require('./resemble');
+const resemble = require("./resemble");
 
-module.exports = function(image1, image2, options) {
-  return new Promise(function(resolve, reject) {
-    resemble.compare(image1, image2, options, function(err, data) {
-      if (err) {
-        reject(err);
-      } else {
-        resolve(data);
-      }
+module.exports = function compareImages(image1, image2, options) {
+    return new Promise((resolve, reject) => {
+        resemble.compare(image1, image2, options, (err, data) => {
+            if (err) {
+                reject(err);
+            } else {
+                resolve(data);
+            }
+        });
     });
-  });
 };