Add .travis.yml file to disable CI-build

This file disables building for this branch and disables email notifications,
just in case someone forgets to disable the travis hook before pushing the
bazaar-integration branch (*cough*me*cough*).
We'll have to see how this plays along with new upstream changes, so I'll only
push it to the orga repo once I've successfully tested it in my own.
committing subversion revision 8639 by Automation-Service
Merge in upstream bzr r8639