Buffer overflow error in Travis-CI build using OpenJDK6

[ooasis]

My PR #116 has recently failed in Travis-CI due to "Buffer overflow error".

Here is an example from the latest build: https://travis-ci.org/OpenTSDB/asynchbase/builds/114608234

I suspect this is the same many people reported here: travis-ci/travis-ci#5227

-thanks

[manolama]

Should be good now. Added a config fix for Travis to solve that one.