Adds liniting into the workflow (#3082)

* initial linting of src

* fix indent to 2 spaces

* Removes unnecessary rules

* ignore spec folder for now

* Spec linting

* Fix spec indent

* nits

* nits

* no no-empty rule

package.json

@@ -46,6 +46,7 @@
   "devDependencies": {
     "babel-cli": "6.18.0",
     "babel-core": "6.18.2",
+    "babel-eslint": "^7.1.1",
     "babel-plugin-syntax-flow": "6.13.0",
     "babel-plugin-transform-flow-strip-types": "6.18.0",
     "babel-preset-es2015": "6.14.0",
@@ -54,6 +55,8 @@
     "bcrypt-nodejs": "0.0.3",
     "cross-env": "3.1.3",
     "deep-diff": "0.3.4",
+    "eslint": "^3.10.2",
+    "eslint-plugin-flowtype": "^2.25.0",
     "gaze": "1.1.1",
     "istanbul": "1.0.0-alpha.1",
     "jasmine": "2.5.2",
@@ -64,6 +67,7 @@
   },
   "scripts": {
     "dev": "npm run build && node bin/dev",
+    "lint": "eslint ./",
     "build": "babel src/ -d lib/",
     "test": "cross-env MONGODB_VERSION=${MONGODB_VERSION:=3.2.6} MONGODB_STORAGE_ENGINE=mmapv1 NODE_ENV=test TESTING=1 $COVERAGE_OPTION jasmine",
     "test:win": "npm run pretest && cross-env NODE_ENV=test TESTING=1 node ./node_modules/jasmine/bin/jasmine.js && npm run posttest",