add a Travis CI config

just giving Travis CI a try
Travis oops
Travis try again
solve Problem 59 without using a dictionary file
upgrade to sbt 0.13.0-RC4
Merge remote-tracking branch 'origin/master' into sbt-0.13
prospective fix for Travis timeouts
another prospective fix for Travis timeouts
another prospective fix for Travis timeouts
another prospective fix for Travis failures

maybe it's not a timeout issue at all?
Merge remote-tracking branch 'origin/master' into sbt-0.13
Travis: Use default script and default JVM options
Merge pull request #1 from gildegoma/travis-defaults

Travis CI: Use default script and default JVM options
in Travis config, keep heap usage down
Merge branch 'master' into sbt-0.13
Merge branch 'sbt-0.13' into scala-2.11