Additional steps for guide

[hubdotcom]

1. ppa:chris-lea/node.js has node version v0.10.37 but npm install request requires v0.10.40
2. before running tests, need to install and run composer

Results are great! Well done :)

NodeJS v4.0.0 + Cheerio
real    0m28.448s
user    0m5.257s
sys 0m2.024s

NodeJS v4.0.0 + Cheerio 64
real    0m15.810s
user    0m5.539s
sys 0m2.250s

PHP 5.5.29 + phpQuery
real    4m17.532s
user    0m6.697s
sys 0m1.332s

PHP 5.5.29 + ReactPHP + phpQuery
real    0m17.425s
user    0m6.536s
sys 0m1.457s