Automatically publish snapshots

[deadmoose]

Travis builds in response to commits, but doesn't publish its snapshots upstream. The one [current-version]-SNAPSHOT release is increasingly out of date, so things like tripleplay's travis build constantly fail.

(See also: tripleplay where I'm about to file a very similar issue since I have a TP-based project with a travis build that constantly fails thanks to both of these having out-of-date snapshots unless I pull cpu-wasting hackery such as https://github.com/deadmoose/bort/blob/ace9b8f05c7609210bb880b414f7d90fa81f5341/.travis.yml )

[samskivert]

These bombs are away.