Pandoc-fignos

* Fixed bug for filenames with spaces (Issue 23).
* Fixed metadata corruption bug (Issue 23).
* Fixed python 2.7 install on Windows (Issue 26).
* Fixed cleveref bug for textless doc (Issue 27).
* Require pandoc-xnos >= 0.5.

* Support for unnumbered figures in TeX/pdf (Issue 15).
* Removed anchors and ids in output for unreferenceable figures.

* Added figure tags.
* Changed caption separator from period to colon for html output
to be consistent with TeX/pdf.

* Added clever referencing (Issue 13).
* Moved library code to pandocxnos project.

* Support reference links for pandoc < 1.16 (Issue 14).

* Bug fix to allow for attributed (non-figure) images.
* Better pandoc version detection.