Add JSHint and JSCS to the build

.jscsrc

@@ -0,0 +1,22 @@
+{
+  "preset": "google",
+  "maximumLineLength": 180,
+  "disallowMultipleVarDecl": false,
+  "validateIndentation": false,
+  "disallowTrailingWhitespace": false,
+  "jsDoc": {
+    "checkAnnotations": {
+      "extra": {
+        "polymerBehavior": true,
+        "param": true,
+        "return": true,
+        "private": true,
+        "default": true,
+        "event": true,
+        "property": true,
+        "type": true,
+        "method": true
+      }
+    }
+  }
+}

.jshintrc

@@ -1,4 +1,5 @@
 {
   "browser": true,
-  "node": true
+  "node": true,
+  "expr": true
 }

.travis.yml

@@ -2,6 +2,8 @@ language: java
 install: travis_retry npm install
 jdk: oraclejdk8
 script:
+  - gulp lint:js
+  - gulp lint:html
   - gulp clean
   - gulp gwt:validate
   - travis_retry gulp test:desktop

package.json

@@ -7,7 +7,7 @@
   "dependencies": {
     "bower": "latest",
     "fs-extra": "latest",
-    "del" : "latest",
+    "del": "latest",
     "gulp": "latest",
     "gulp-git": "latest",
     "gulp-json-editor": "latest",
@@ -27,11 +27,15 @@
     "gemini-sauce": "^0.9.1",
     "gulp-bower": "0.0.10",
     "gulp-download": "0.0.1",
+    "gulp-html-extract": "0.0.3",
     "gulp-insert": "latest",
+    "gulp-jscs": "^3.0.2",
+    "gulp-jshint": "^2.0.0",
     "gulp-rsync": "0.0.5",
     "gulp-unzip": "^0.1.3",
     "gulp-zip": "^2.0.3",
     "hash-files": "^1.0.0",
+    "jshint": "^2.8.0",
     "lodash": "^3.5.0",
     "node-ssh-exec": "^0.1.1",
     "require-dir": "^0.1.0",

tasks/lint.js

@@ -0,0 +1,38 @@
+var gulp = require('gulp');
+var jscs = require('gulp-jscs');
+var jshint = require('gulp-jshint');
+var htmlExtract = require('gulp-html-extract');
+
+gulp.task('lint:js', function() {
+  return gulp.src([
+        '*.js',
+        '!*.min.js',
+        'test/*.js',
+        'tasks/*.js'
+      ])
+      .pipe(jshint())
+      .pipe(jshint.reporter())
+      .pipe(jshint.reporter('fail'))
+      .pipe(jscs())
+      .pipe(jscs.reporter())
+      .pipe(jscs.reporter('fail'));
+});
+
+gulp.task('lint:html', function() {
+  return gulp.src([
+        '*.html',
+        'demo/*.html',
+        '!demo/angular2.html',
+        '!demo/react.html',
+        'test/*.html'
+      ])
+      .pipe(htmlExtract({
+        sel: 'script, code-example code'
+      }))
+      .pipe(jshint())
+      .pipe(jshint.reporter())
+      .pipe(jshint.reporter('fail'))
+      .pipe(jscs())
+      .pipe(jscs.reporter())
+      .pipe(jscs.reporter('fail'));
+});