DOC-237 Update Node.js installation instructions. Other cleanup.
DOC-237 Update Node.js installation instructions. Other cleanup.

misterbisson/sdc-cloudapi,misterbisson/sdc-cloudapi,KrisShannon/sdc-cloudapi,KrisShannon/sdc-cloudapi,arekinath/sdc-cloudapi,joyent/sdc-cloudapi,joyent/sdc-cloudapi,arekinath/sdc-cloudapi