Review: https://reviews.apache.org/r/6733/
Testing: Applied patch, and ran 'ant clean-all build-apidocs'
on both OSX and Ubuntu 12. Initial testing confirmed the issue
that Greg discovered on OSX. After the patch, the docs built
correctly.
API docs. Uses XML/XSLT generation system originally by Abhinandan Prateek
(I think). CSS updates from Jessica Tomechak. gen_toc.py and build script
changes by me.