added spec for linting js

.jscsrc

@@ -0,0 +1,13 @@
+{
+    "validateIndentation": 4,
+    "safeContextKeyword": ["_this", "widget"],
+    "requireSpaceBeforeKeywords": [
+        "else",
+        "while",
+        "catch"
+    ],
+    "disallowMultipleVarDecl": "exceptUndefined",
+    "excludeFiles": ["node_modules/**", "**/*.min.js", "**/vendor/**/*.js"],
+    "fileExtensions": [".js"],
+    "preset":"airbnb"
+}

package.json

@@ -0,0 +1,32 @@
+{
+  "name": "wagtail",
+  "version": "1.0.0",
+  "repository": "https://github.com/torchbox/wagtail",
+  "private": true,
+  "browser": {},
+  "browserify": {
+    "transform": [
+      "browserify-shim"
+    ]
+  },
+  "browserify-shim": {},
+  "devDependencies": {
+    "browserify": "~3.36.0",
+    "browserify-shim": "~3.4.1",
+    "gulp": "~3.8.11",
+    "gulp-autoprefixer": "~1.0.1",
+    "gulp-pixrem": "~0.1.1",
+    "gulp-rename": "^1.2.2",
+    "gulp-sass": "~1.0.0",
+    "gulp-sourcemaps": "~1.2.2",
+    "gulp-util": "~2.2.14",
+    "jscs": "^1.12.0"
+  },
+  "dependencies": {},
+  "scripts": {
+    "build": "gulp build",
+    "start": "gulp watch",
+    "lint:js": "./node_modules/.bin/jscs ./wagtail || true",
+    "format:js": "./node_modules/.bin/jscs ./wagtail -x"
+  }
+}