gemspec: bug fixes

* Add missing require_paths
* Add missing dependency on killbill-client

Signed-off-by: Pierre-Alexandre Meyer <pierre@mouraf.org>
load_base: fix reporting when there is no data

Signed-off-by: Pierre-Alexandre Meyer <pierre@mouraf.org>
load_base: sort results by tp90

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