Fix ugly PDF chapter division by dropping content of main page.
Exclude history document from the Sphinx sources.

It's still shipped with the rest of the documentation, it's just not
part of the files processed by Sphinx because LaTeX can't handle UTF-8
Chinese characters without special packages and a customized build
workflow to create the PDF output.
Merge pull request #203 from pymssql/better-doc-pdf-output

Better doc pdf output