Update Guides/PHP/Yii.md

minor change in 1.Install Yii framework
Modified PHP AWS S3 Guide

* Changed the guide to reference a example repository on Github.
* Removed upload functionality since the app is not password protected.
* Added section at the end that suggests to undeploy and delete the example app.
* Plus some additional language and structure changes.
Merge branch 'master' of github.com:cloudControl/documentation
Get packages index from S3 instead of Github
Merge pull request #62 from fern4lvarez/master

Link to Windows Installer on S3 instead of the deprecated Github Downloads feature.
Change windows installer link
Merge pull request #63 from fern4lvarez/master

Missed one Windows installer link.
Fixed URL for New Relic's PHP-API Documentation
Merge pull request #65 from sebastianpicklum/master

Fixed URL for New Relic's PHP-API Documentation