Remove o-auth account creation

Accounts can only be created with Github or email

server/utils/auth.js

@@ -1,5 +1,3 @@
-import assign from 'object.assign';
-
 const providerHash = {
   facebook: ({ id }) => id,
   twitter: ({ username }) => username,
@@ -32,15 +30,16 @@ export function setProfileFromGithub(
     name
   }
 ) {
-  return assign(
+  return Object.assign(
     user,
-    { isGithubCool: true, isMigrationGrandfathered: false },
     {
       name,
+      email: user.email || githubEmail,
       username: username.toLowerCase(),
       location,
       joinedGithubOn,
       website,
+      isGithubCool: true,
       picture,
       githubId,
       githubURL,