LS-18: Fix PHP-nginx Integration

* Increase fastcgi proxying timeout
* Log more of the things
* Remove 4XX and 5XX response docs that do not exist
Merge pull request #9 from mike-spainhower/LS-18-fix-php-nginx-integration

LS-18: Fix PHP-nginx Integration

* Increase fastcgi proxying timeout
* Log more of the things
* Remove 4XX and 5XX response docs that do not exist
* Serve actually existent index file