Add ESLint configuration

ESLint, although listed as a dependency, had no configuration. This moves
the package to the same configuration used throughout the rest of the
providers and adds a script to run it.

Author: Arcanemagus

package.json

@@ -24,20 +24,34 @@
     "atom-package-deps": "^4.0.1"
   },
   "devDependencies": {
-    "eslint": "latest"
+    "eslint": "^3.9.1",
+    "eslint-config-airbnb-base": "^10.0.1",
+    "eslint-plugin-import": "^2.1.0"
   },
   "package-deps": [
     "linter"
   ],
+  "scripts": {
+    "lint": "eslint .",
+    "test": "apm test"
+  },
   "eslintConfig": {
+    "extends": "airbnb-base",
+    "rules": {
+      "global-require": "off",
+      "import/no-unresolved": [
+        "error",
+        {
+          "ignore": [
+            "atom"
+          ]
+        }
+      ]
+    },
     "env": {
-      "es6": true,
       "browser": true,
       "node": true
     },
-    "ecmaFeatures": {
-      "modules": true
-    },
     "globals": {
       "atom": true
     }