Suppress errors via `libxml_use_internal_errors`
Update documentation on errors and warnings.
Add mention of 500 and 504 errors to readme
Use a hash of the HTML as an identifier, insted of content type, page etc. re: issue #31 hat-tip to janw.oostendorp
Update readme with information on Woocommerce conflicts
Update version information
Add informaiton about plans for Picturefill.WP 2 to the FAQ
Re-order transisent handle for better readability