IAMDOC-169  Updated the php quickstart.
Updating PHP docs.
Updating PHP product guide based on REST product guide.
Merge branch 'php-sdk-overhaul-docs' into source

Conflicts:
	public/atom.xml
	public/php/product-guide/index.html
	public/php/quickstart/index.html
	public/python/quickstart/old.index.html
	public/rest/product-guide/index.html
	public/sitemap.xml
	source/php/product-guide/index.markdown
	source/php/quickstart/index.markdown