Update PhantomJS to latest for Ubuntu dev guide?

AI-generated summary

The original Ubuntu dev guide installs an outdated version of PhantomJS (1.9.8) from 2014. dmitry_fedyuk points out that the latest stable version is 2.1.1. However, sam reveals that PhantomJS is no longer needed, as it was dropped last week. techAPJ has updated the Ubuntu development guide and Mac install script to remove PhantomJS installation steps.

@techAPJ

«Beginners Guide to Install Discourse on Ubuntu for Development» says:

cd /usr/local/share
sudo wget https://bitbucket.org/ariya/phantomjs/downloads/phantomjs-1.9.8-linux-x86_64.tar.bz2
sudo tar xvf phantomjs-1.9.8-linux-x86_64.tar.bz2
sudo rm phantomjs-1.9.8-linux-x86_64.tar.bz2
sudo ln -s /usr/local/share/phantomjs-1.9.8-linux-x86_64/bin/phantomjs /usr/local/bin/phantomjs
cd

github.com/ariya/phantomjs/releases/tag/1.9.8
It is released on 2014-10-23.

The latest stable version of PhantomJS is 2.1.1:

We actually totally dropped phantom last week, guides and scripts should be updated cc @techAPJ and @tgxworld

Okay, I updated the Ubuntu development guide and Mac install script to remove Phantom.js installation steps.