Change ESLint quote-props rule to as-needed

Also fixes all files flagged by the rule

.eslintrc

@@ -174,7 +174,7 @@
     "one-var": 0,
     "operator-assignment": 0,
     "padded-blocks": 0,
-    "quote-props": 0,
+    "quote-props": [2, "as-needed"],
     "quotes": [
       2,
       "single",

common/app/components/Nav/NavItem.jsx

@@ -57,7 +57,7 @@ export default React.createClass({
     const linkClassName = classNames(className, {
       // 'active': active, we don't actually use the active class
       // but it is used for a11y below
-      'disabled': disabled
+      disabled: disabled
     });
 
     let linkProps = {

common/app/routes/Jobs/components/NewJob.jsx

@@ -48,7 +48,7 @@ const certTypes = {
 };
 
 function isValidURL(data) {
-  return isURL(data, { 'require_protocol': true });
+  return isURL(data, { require_protocol: true });
 }
 
 const fields = [

common/app/routes/Jobs/utils.js

@@ -1,5 +1,5 @@
 const defaults = {
-  'string': {
+  string: {
     value: '',
     valid: false,
     pristine: true,

common/models/user.js

@@ -44,7 +44,7 @@ module.exports = function(User) {
 
   // username should not be in blacklist
   User.validatesExclusionOf('username', {
-    'in': blacklistedUsernames,
+    in: blacklistedUsernames,
     message: 'is taken'
   });
 

common/utils/ajax-stream.js

@@ -274,7 +274,7 @@ export function postJSON$(url, body) {
     responseType: 'json',
     headers: {
       'Content-Type': 'application/json',
-      'Accept': 'application/json'
+      Accept: 'application/json'
     }
   })
     .map(({ response }) => response);
@@ -303,7 +303,7 @@ export function getJSON$(url) {
     responseType: 'json',
     headers: {
       'Content-Type': 'application/json',
-      'Accept': 'application/json'
+      Accept: 'application/json'
     }
   }).map(({ response }) => response);
 }

server/middlewares/migrate-completed-challenges.js

@@ -85,7 +85,7 @@ function buildChallengeMap(userId, completedChallenges = [], User) {
     }, {})
     .flatMap(challengeMap => {
       const updateData = {
-        '$set': {
+        $set: {
           challengeMap,
           isChallengeMapMigrated: true
         }

server/utils/auth.js

@@ -24,9 +24,9 @@ export function setProfileFromGithub(
   },
   {
     id: githubId,
-    'avatar_url': picture,
+    avatar_url: picture,
     email: githubEmail,
-    'created_at': joinedGithubOn,
+    created_at: joinedGithubOn,
     blog: website,
     location,
     name