chore: add jshint dev dependency

Author: matmkian

package.json

@@ -24,6 +24,7 @@
     "gulp-templatecache": "0.0.3",
     "gulp-uglify": "^1.0.0",
     "gulp-watch": "^0.7.0",
+    "jshint": "^2.9.3",
     "jshint-summary": "^0.4.0",
     "merge-stream": "^0.1.5",
     "minimist": "^1.1.0"