Don't need to sync _site folder...

… because that gets generated on the server anyways
new class '_book' to represent book styles

Use to specify things specifically for book printing.
For example, this would resize all of my images in the book.
._book .eb-images {
   width: 200pt;
}
regenerated site elements
fixes for book printing
book styles are distinct from print styles
refinements to book system— allow for spreads
Merge branch 'gh-pages' of https://github.com/risd-gd/htmloutput into gh-pages