Adding the Guavuslabs repo for publishing.
We publish to repo.guavuslabs.com/nexus.

We will be using the `guavus/master/ci-server` branch to publish to our
Nexus server at `https://repo.guavuslabs.com/nexus`.

[ticket:CAB-13]: https://guavuslabs.atlassian.net/browse/CAB-13
Jenkins[]: spark-guavus_master_ci-server 4:2013-07-01_19-04-06
Jenkins[master]: spark-guavus_master_ci-server - 7:2013-07-01_19-45-46
Merge branch 'guavus/master/ci-server' of github.com:Guavus/spark into guavus/master/ci-server