added titan elasticsearch dependency.
updated CHANGELOG.textile
set <titan.version> in pom.xml to be 0.4.2-SNAPSHOT for staging for Dan for the release.
Changing from Titan 0.4.2-SNAPSHOT to 0.4.2
Update doc submodule commit pointer
Update doc submodule commit pointer
[maven-release-plugin] prepare release 0.4.2
[maven-release-plugin] prepare for next development iteration
Set titan.version to 0.4.3-SNAPSHOT
Update CHANGELOG.textile