Add travis-ci, hopefully without spamming the BC folks

Pretty sure BouncyCastle needs OpenJDK to build and run tests

I don't know how to register the unsigned JCE provider on Oracle JDK,
OpenJDK doesn't seem to check.

try to make travis output clearer

http://stackoverflow.com/a/17942820/438886

The '--info' flag hopefully will stop travis builds from
dying from the no-output-in-10-minutes problem, but weirdly is
also the only thing that makes spongycastle tests pass...

https://twitter.com/rtyley/status/425373078084784128

https://travis-ci.org/rtyley/spongycastle/builds/17299026
Froom boost