Added author keywords

Added to samples and added to live files from 1st Sept
Merge branch 'master' of https://github.com/elifesciences/elife-poa-xml-generation
Merge branch 'master' of https://github.com/elifesciences/elife-poa-xml-generation
JATS xml upgrade

Sample file
Merge branch 'master' of github.com:elifesciences/elife-poa-xml-generation into pubmed