Adds Mcrypt PHP extension and Laravel CLI

Updated README with this information
Updates README file to remove the Work in Progress info.

Its already clear by the branches separation.
Adds a symlink projects' folder inside user's folder

Creates a symbolic link of the projects folder in the user's home folder
so it is easily accessible after accessing the VM via `vagrant ssh`
Updates provision to install the latest version of PHP
Adds Karma Test Runner to the provision
Updates README subtitle and Why texts