Ebookmaker

- linked images (image files as targets of links) are now wrapped in html, fixing display in ADE.
- linked images are compressed to 1MB if possible (changed from 128K)
- inline images are compressed to 256K if possible (changed from 128K)
- all images are limited to 5000x5000 pixels (was 800 x 1280)
- PNG images are scaled to meet the image filesize targets (previously no scaling of PNG images)
- L format JPEG images (greyscale) are no longer converter to RBG (thanks rfrank)
- generated covers are now 1200 x 1800
- covers and "important" images in noimages builds are scaled to 64K (previously no scaling)

General bug fixes
- eliminated double parsing due to first pass using raw paths
- when tidy fails, the (huge) error trace is only logged once.
- generated html is no longer overwritten by empty results

- corrected the exception to catch for missing files

- It turns out that ebookmaker gets called both with bare paths and file: urls depending on ebookconverter config files. So 0.8.10 broke on the production machine, though it seemed just fine on mac and windows. So we went back to the drawing board to figure out how to support posix and windows, with or without windows mount points (not sure if that's the right term), file:/// urls and bare paths. We also figured out some issues involving spaces in paths.

- fixed numerous file path nits on Windows
- kindlegen
- figsdir
- cover
- pdf
- PEP8 delinted:
- EbookMaker.py
- ParserFactory.py
- Spider.py
- parsers/__init__.py
- writers/EpubWriter.py

- fixed issues preventing successful deployments on Windows
- added logging for books deeper than max_depth
- improved documentation for tidy and cairo prerequisites
- try to catch and report exceptions when tidy and cairo aren't installed
- added install-on-windows notes