Tell Travis CI to notify the PDC WebHook

Without this patch the so-called "puppet development community" hook
service isn't being notified when Travis CI accepts jobs.  This is a
problem because we want the ability for Travis Bot to comment on pull
requests as a result of CI build results.  For example, if the build
fails, then Gepetto Bot could make some helpful suggestions on how to
re-run the build by amending a commit and force-pushing the branch.

This patch uses the notifications section of the travis.yml
configuration file, as documented at:
http://about.travis-ci.org/docs/user/notifications/#Webhook-notification

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