Update vancouver.csl

Changes: 
+ display "inventor" after inventor's name
+ correctly display webpages (according to 2011 update)
+ display PMCID, or PMID (if available)
On Saturday, July 5, 2014, Rintze M. Zelle <notifications@github.com> wrote:

> In vancouver.csl:
>
> > @@ -31,6 +31,10 @@
> >      <terms>
> >        <term name="retrieved">available</term>
> >        <term name="section" form="short">sect.</term>
> > +      <term name="original-author">
> > +        <single>inventor</single>
> > +        <multiple>inventors</multiple>
> > +      </term>
>
> For popular styles like Vancouver this kind of hack seems like a solid
> "no".
>
It does raise an interesting issue in CSL, though. Would it contribute to
data consistency to have type-specific variants to the label variables? Not
one to be settled here, but might that be worth discussing on
xbiblio-devel, in connection with input validation?


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> <https://github.com/citation-style-language/styles/pull/1013/files#r14570069>
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