Git pre-push checks for UI (#3072)

* Added eslint cached option (#2291)

* Added pre-push script running linting (#2291)

* Modifies pre-push hook to run if eslint installed // auto install hook

* Update pre-push script comment

* Added husky for git hooks (#3072)

js/.gitignore

@@ -6,3 +6,4 @@ build
 .dist
 .happypack
 .npmjs
+.eslintcache

js/package.json

@@ -39,9 +39,11 @@
     "clean": "rm -rf ./build ./coverage",
     "coveralls": "npm run testCoverage && coveralls < coverage/lcov.info",
     "lint": "eslint --ignore-path .gitignore ./src/",
+    "lint:cached": "eslint --cache --ignore-path .gitignore ./src/",
     "test": "mocha 'src/**/*.spec.js'",
     "test:coverage": "istanbul cover _mocha -- 'src/**/*.spec.js'",
-    "test:e2e": "mocha 'src/**/*.e2e.js'"
+    "test:e2e": "mocha 'src/**/*.e2e.js'",
+    "prepush": "npm run lint:cached"
   },
   "devDependencies": {
     "babel-cli": "^6.10.1",
@@ -84,6 +86,7 @@
     "happypack": "^2.2.1",
     "history": "^2.0.0",
     "html-loader": "^0.4.4",
+    "husky": "^0.11.9",
     "ignore-styles": "2.0.0",
     "image-webpack-loader": "^1.8.0",
     "istanbul": "^1.0.0-alpha.2",