Ebookmaker

- 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

- fixed issue preventing chunking when text file is latin-1
- fixed failure when source links to a directory
- improved parse error message

- fixed issue causing failed build when file encoding doesn't match plateform default
- fixed issue where cover set on command line is excluded in build.

- fixed issue where covers aren't set when source is txt