nodejs v7.1.0 errors on gulp commands

[jmartinm]

Mac OS with nodejs v7.1.0

When I run any gulp command, like npm run test the following error happens:

/Users/jmartinm/.virtualenvs/invenio3/src/invenio-search-js/node_modules/karma/node_modules/socket.io/lib/store.js:35
Store.prototype.__proto__ = EventEmitter.prototype;
                                        ^

TypeError: Cannot read property 'prototype' of undefined
    at Object.<anonymous> (/Users/jmartinm/.virtualenvs/invenio3/src/invenio-search-js/node_modules/karma/node_modules/socket.io/lib/store.js:35:41)
    at Module._compile (module.js:573:32)
    at Object.Module._extensions..js (module.js:582:10)
    at Module.load (module.js:490:32)
    at tryModuleLoad (module.js:449:12)
    at Function.Module._load (module.js:441:3)
    at Module.require (module.js:500:17)
    at require (internal/module.js:20:19)
    at Object.<anonymous> (/Users/jmartinm/.virtualenvs/invenio3/src/invenio-search-js/node_modules/karma/node_modules/socket.io/lib/manager.js:16:13)
    at Module._compile (module.js:573:32)

Which is caused by old karma using functions deprecated in newer Nodejs (similar to LearnBoost/websocket.io#55).