jruby: better error messages on plugin startup

Signed-off-by: Pierre-Alexandre Meyer <pierre@mouraf.org>
jruby: add support for OpenSSL with JRuby

* Add default imports/exports
* Upgrade JRuby version

Signed-off-by: Pierre-Alexandre Meyer <pierre@mouraf.org>
payment: fix error handling in pagination calls

Signed-off-by: Pierre-Alexandre Meyer <pierre@mouraf.org>
Merge branch 'master' of github.com:killbill/killbill