Language handling, relative paths

Fixed and refined language handling. Changed XPATH to relative paths
for ease of use for those altering the stylesheet to work with an
article set rather than a single article.
Languages, ORCID, Dates

Further refined language handling, added ORCID handling, new model for
collection dates.
New formatting templates

New pubmed handling of sup, sub, bold, italic
Merge pull request #2 from ahamelers/master

2014 Updates