Add Option to create pandoc-formatted inline citations

[cboettig]

I'm thinking the more sensible thing might be to have knitcitations write an external bibtex file, and convert its citations into pandoc's format instead, from whence you could then use pandoc (+ the CSL stylesheet) to process and format the references that kniticitations has generated.

In this case something like:

options("citation_format", "pandoc")
citet("10.1098/rspb.2013.1372")

would create the citation such as [@Boettiger2013], and bibliography("refs.bib") would generate the output bib file to be used in pandoc. Alternatively, references could be added as a yaml (note that the yaml metadata blocks can be anywhere in the document).

[johnstantongeddes]

I like this. Since discovering rmarkdown and it's render function it seems that there's a trend towards using pandoc, which would be consistent with your proposal. This would also allow for an easy workaround in the cases where DOI fails to find the correct reference.

[cboettig]

Okay, this is implemented in 0.6. Give it a try, feeback welcome.