replace underscore with our own

we only need like 5 simple functions

src/routes/users.js

@@ -34,7 +34,7 @@ const assert = require('assert'),
     HttpSuccess = require('connect-lastmile').HttpSuccess,
     safe = require('safetydance'),
     users = require('../users.js'),
-    _ = require('underscore');
+    _ = require('../underscore.js');
 
 async function load(req, res, next) {
     assert.strictEqual(typeof req.params.userId, 'string');
@@ -117,7 +117,7 @@ async function updateProfile(req, res, next) {
 
     if (users.compareRoles(req.user.role, req.resource.role) < 0) return next(new HttpError(403, `role '${req.resource.role}' is required but you are only '${req.user.role}'`));
 
-    const data = _.pick(req.body, 'username', 'email', 'fallbackEmail', 'displayName');
+    const data = _.pick(req.body, ['username', 'email', 'fallbackEmail', 'displayName']);
     const [error] = await safe(users.updateProfile(req.resource, data, AuditSource.fromRequest(req)));
     if (error) return next(BoxError.toHttpError(error));