Basic InDesign ICML Writer

Conversion of 'Pandoc' documents to Adobe InCopy ICML, a stand-alone XML format which is a subset of the zipped [IDML format](http://wwwimages.adobe.com/www.adobe.com/content/dam/Adobe/en/devnet/indesign/sdk/cs6/idml/idml-specification.pdf).

InCopy is the companion word-processor to Adobe InDesign and ICML documents can be integrated into InDesign with File -> Place.