add linting precommit hook

Author: chrisbreiding

package.json

@@ -29,6 +29,7 @@
     "lint": "eslint --fix *.js",
     "secure": "nsp check",
     "size": "t=\"$(npm pack .)\"; wc -c \"${t}\"; tar tvf \"${t}\"; rm \"${t}\";",
+    "precommit": "npm run lint",
     "pretest": "npm run lint",
     "test": "mocha",
     "test-debug": "node --inspect --debug-brk ./node_modules/.bin/_mocha",
@@ -47,6 +48,7 @@
     "eslint-plugin-cypress-dev": "1.1.0",
     "eslint-plugin-mocha": "4.11.0",
     "github-post-release": "1.13.1",
+    "husky": "0.14.3",
     "license-checker": "13.0.3",
     "mocha": "3.5.0",
     "mockery": "2.1.0",