Copying doc/(changelog|upgrade) changes to root
Merge branch 'titan09' of github.com:thinkaurelius/titan into titan09
Depend on Objenesis

This was excluded from our dependency on older versions of Kryo, since
Kryo used to include a shaded copy of Objenesis.  As of 2.24.0, Kryo
doesn't include a shaded copy and needs an Objenesis dependency to
work (judging from the list of classfiles in the 2.24.0 jar on
Central).

Thanks @superbeeny

For #828
[maven-release-plugin] prepare release 0.9.0-M1
[maven-release-plugin] prepare for next development iteration