add embedded Dublin Core and DCTERMS metadata; verified works with current Zotero extractors
add rdfa attributes to DC/DCTERMS metadata; doesn't seem to confuse zotero at least; W3C validator hates it, but this is expected
add schema.org microdata to dc/dcterms metadata
modify title as represented in metadata
delete empty generic author meta tag
cleaned up some spacing and indentation issues
add alt tags to all images
fix failed close on an attribute value; add open graph metadata
Merge pull request #5 from paregorios/master

add metadata and clean up content