Fix php error: "PHP Warning:  stristr(): Empty delimiter"
change the tab spacing to match the original project, looks unreable outside of git
merge of mattrude/master (closes #22) - Thank you, Matt!
README: CDN Linker has been extensively tested up to WP 3.5.1 and current SVN trunk (closes #24)
the sample URL is constructed using an actual ICdnForItemStrategy (closes #23)

Thank you, Tyler!