Add support for X-Forwarded-For header
FIX retrieving request headers from $_SERVER
Support non-standard X-Real-IP header
More small formatting fixes
Added CloudFlare example
Added CURLOPT_FOLLOWLOCATION as curl opt
Updated README to markdown
Merge pull request #6 from drkibitz/readme

Updated README to markdown
Merge pull request #5 from drkibitz/x-forwarded-for

X-Forwarded-For, fixes, small cleanup, and X-Real-IP