* Rename the existing concept of a "style name" to "style ID" to correspond to
the terminology used internally in docx files. Any document transforms that
get or set the `styleName` property should use the `styleId` property instead.
* Allow paragraphs and runs to be matched by style name. For instance, to match
a paragraph with the style name `Heading 1`:
p[style-name='Heading 1']
* Use an array of raw strings rather than an array of style mappings when
passing options to convertToHtml.
* Add support for node 0.11 (tested on node 0.11.13).