Added document_typename_application/vnd.openxmlformats-officedocument.wordprocessingml.document for .docx files.
Typo fixed in XML syntax for document_typename_application/vnd.openxmlformats-officedocument.wordprocessingml.document.
Update 80_metafield.js

fixes #270
Merge pull request #271 from jesusbagpuss/patch-1

Update 80_metafield.js
Merge branch '3.3' of upstream