GUI: Added ESLint to gulp tasks. ONOS-6521
Commented out gulp tasks making this change uneffective
Fixed an error in the build script

Change-Id: I4f4f9762aa1a66304aa74b3ab208095b9c1d4515
diff --git a/tools/gui/package.json b/tools/gui/package.json
index 4c2aeb0..304cd54 100644
--- a/tools/gui/package.json
+++ b/tools/gui/package.json
@@ -5,7 +5,8 @@
   "main": "index.js",
   "scripts": {
     "test": "echo \"Error: no test specified\" && exit 1",
-    "build": "./node_modules/gulp/bin/gulp.js build"
+    "build": "./node_modules/gulp/bin/gulp.js build",
+    "dev": "./node_modules/gulp/bin/gulp.js --development"
   },
   "author": "",
   "license": "ISC",
@@ -14,11 +15,18 @@
     "babel": "^6.23.0",
     "babel-core": "^6.25.0",
     "babel-preset-es2015": "^6.24.1",
+    "browser-sync": "^2.18.12",
+    "eslint": "^4.2.0",
+    "eslint-config-google": "^0.9.1",
     "gulp": "^3.9.1",
     "gulp-concat": "^2.6.1",
+    "gulp-eslint": "3.0.1",
+    "gulp-if": "^2.0.2",
     "gulp-sourcemaps": "^2.6.0",
     "gulp-strip-comments": "^2.4.5",
     "gulp-uglify": "^3.0.0",
+    "gulp-webserver": "^0.9.1",
+    "http-proxy-middleware": "^0.17.4",
     "jasmine-core": "^2.6.4",
     "karma": "^1.7.0",
     "karma-babel-preprocessor": "^6.0.1",