npm install failed

Hi,
Thank you for this great repo. I cloned the app on a Ubuntu server in a Virtualbox.
npm install failed. The Nodejs version is latest -- 4.2.4. Which nodejs version should be used?

Please see below. (docker is not used. 'docker-python' is just a name.)

(flask-react)vagrant@docker-python:~/flask-react-bootstrap$ uname -a
Linux docker-python 3.13.0-65-generic #106-Ubuntu SMP Fri Oct 2 22:08:27 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
(flask-react)vagrant@docker-python:~/flask-react-bootstrap$ python --version
Python 2.7.6
(flask-react)vagrant@docker-python:~/flask-react-bootstrap$ node -v
v4.2.4
(flask-react)vagrant@docker-python:~/flask-react-bootstrap$ npm -v
2.14.12
(flask-react)vagrant@docker-python:~/flask-react-bootstrap$ npm install
npm WARN unmet dependency /home/vagrant/flask-react-bootstrap/node_modules/less/node_modules/request/node_modules/http-signature/node_modules/sshpk requires assert-plus@'>=0.2.0 <0.3.0' but will load
npm WARN unmet dependency /home/vagrant/flask-react-bootstrap/node_modules/less/node_modules/request/node_modules/http-signature/node_modules/assert-plus,
npm WARN unmet dependency which is version 0.1.5

Regards,
YW