Merged in tychoish/sphinx (pull request #146)

resolve issue #1172: don't divide by zero
Fix ZeroDivisionError in Parallel Builds. Thanks to tychoish. Closes #1172
Merged in rolmei/sphinx-epub (pull request #148)

new predefined tags; epub fixes.
Fix i18n: gettext did not translate admonition directive's title. Closes #1206
Merged in ericholscher/sphinx (pull request #150)

A pull request with some developer documentation updates
fix: broken document format (rst)
for testing: change docutils version spec 0.10.0 -> 0.10
add docutils-0.11 for testing
Support docutils.conf 'writers' and 'html4css1 writer' section by html writer.
latex, manpage and texinfo writers support 'writers' section.
Add some URLs to example list.
Add test for docutils.conf and prevent 'html4css1.css' missing warning.
Now --embed-stylesheet option default become false.
support parallel testing with detox
Sphinx generates broken ePub on Windows. Closes #1232
Unify exceptions caught in EpubBuilder.copy_image_files
Avoid confusing PIL warning for vector graphics (epub builder).
Unify usage of os.path/path in EpubBuilder.
Add warning for unusual chars in filenames. Closes #1199
Add coverage targets in quickstart generated Makefile and make.bat.
Merged in mcmtroffaes/sphinx-make-coverage (pull request #159)

Add coverage targets to quickstart generated Makefile and make.bat.
* sync message text in Makefile/make.bat and make-mode.
* update CHANGES for adding coverage targets.