Ebookmaker

- fix bug in stand-alone kindle generation

- one more change. can't use xml write mode for html, because Chrome and Safari no longer support self-closing tags.

Adds notification support
- Add queue_notifications method in CommonCode, usable by both EbookConverter and EbookMaker
- configure notifications for missing file problems
- remove parsers for missing files - bug exposed by html generation
- fixed regression in WrapperParser
- add coverage by test file
- enhanced log formatting
- refactored log setup for use with
- started using CRITICAL logs to trigger notifications

Bugfixes for stand-alone use. We should not have released 0.11.1 on pypi.

- Ebookmaker 0.11.1 did not work without psycopg2 and the PG database. Neither did libgutenberg 0.7.2. This version, with libgutenberg 0.8.1, works without the PG database or psycopg2.
- uses libcountry for language name lists.
- uses old dc object if database not present

Fixes for Ebookconverter compatibility. 0.11.0 was never deployed.

- stop using old dc object, no use only ORM for db access
- since the ORM dc object contains a session, it can't be pickled. But EbookConverter sends a pickled job queue to EbookConverter to process, presumably to enable processing on multiple servers. So job queues no longer can contain dc objects. EbookMaker now gets a new (ORM) dc object for every job.
- when making txt output, EBM was relying on not also generating html except for rst. so now we check directly for txt source when creating.
- assorted delinting

Ebookmaker version 0.11 makes enhanced HTML files for all types of input, including HTML source files. Here are the improvements and other changes made to HTML source:

- all HTML files are cleaned by HTML Tidy. Tidy does the following:
- converts all HTML to well-formed UTF8-encoded XHTML files. This will allow the PG server to add encoding to MIME headers, improving browser compatibility and accessibility.
- LF is used as the newline character for all files (unix standard)
- html entities such as "`’`" `Á` etc. are converted to unicode characters
- correct badly formed HTML, improving browser compatibility and standards conformance.
- Because the files are now guaranteed to be well-formed, DOM manipulation can be done reliably by browser plugins, mobile apps, proxy servers, accessibility tools and PG's own file processors.
- inline style attributes are moved to a generated inline stylesheet for better rendering performance.
- a doctype declaration for XHTML+RDFa 1.1 is used for all files to allow validation with included RDFa metadata.
- tags are now uniformly lower case
- some legacy presentational tags (`<i>,` `<b>`, `<center>` when enclosed within appropriate inline tags, and <font>) are replaced with CSS <style> tags and structural markup as appropriate.
- empty paragraphs are discarded.
- any text in the body element is wrapped in a `<p>` element.
- added RDFa data, Dublin Core, and schema.org metadata to head element of HTML for better SEO and facebook unfurls. Changes in the metadata are now reflected in the HTML presentation

Some incidental changes were necessary to make this possible:
- Because the generated html is moved to a new directory, linked files also needed to be moved.
- Because the generated file has a different name, back-links needed to be changed

It is possible that rendering of the HTML is changed by this additional processing; however, the changed rendering would be aligned aligned with what has long existed in PG EPUB files.

Note that the unprocessed source files will continue to be available without URL change on the PG web site.

- Don't stop generating html with first html file.
- Don't generate wrapper files when spidering to generate html
- Move media handling to EpubWriter, not in parser.
- Also copy css and images to target directory
- Don't rewrite urls on output; they're already relative
- Let Spider follow "nofollow" links; instead have EpubWriter remove the nofollow links and corresponding files
- added USAGE.md to provide better documentation for html authors preparing files for Ebookmaker
- removed data-* attributes for epub because these attributes are not allowed in EPUB 2.0.1 and files were thus failing EpubCheck
- add RDFa data and schema.org metadata to head element of generated HTML for better SEO and facebook unfurls
- now using the doctype declaration for XHTML+RDFa 1.1 for generated HTML from libgutenberg >= 0.7.1
- added a tidy config to eliminate dependence on system configured tidy and to turn off drop-empty-elements, an option not available at the command line. Dropping empty spans/divs was having unexpected effects on css rendering; easily worked around, but confusing for producers.