Update gh-pages release script

I'm modifying the old gh-pages-update.sh to work on the 0.5.x series.
The AsciiDoc changes between 0.4 and 0.5 made it unsafe to use on 0.5,
but now it just does javadoc and should be fine.  Also updated the
index.html template to match the current version live on the gh-pages
website right now.
Update cassandra.yaml used in testing

Replaced old cassandra.yaml template with one from 2.0.9.  I did this
after noticing that several timeout options honored by Cassandra 2.x
were not present in our old cassandra.yaml template (and the short
defaults may have caused a CI failure).
Make ES bind to 127.0.0.1 for testing

Checking to see if this resolves an issue with the ES tests on CI
Add @Category for nondeterministic tests

The BrittleTests category marks tests that are nondeterministic or
intrinsically racy (e.g. hardcoded Thread.sleep without any
synchronization primitive) and which fail intermittently due to timing
problems on either CI, my workstation, or both.