Fix the travis build: exclude jacoco, sunjdk6; don't deploy

Get the travis build working again.

Changes:

* Create a separate maven profile for travis, without the jacoco rule (I don't think travis can find jacoco).
* Remove sunjdk6 from the travis.yml; it is no longer available on travis so gives an error.
* Change mvn deploy to mvn package; deployment to the snapshot repo wasn't working otherwise.