1) Account Timelines, 2) Invoices  are now moved to client side
removed local settings wrongly checked in
fixes after changes suggested
add search call to payment method
Add test cases for relations and new model methods
Reverting local changes of killbill server
Merge branch 'master' of git://github.com/devaroop/killbill-client-ruby into devaroop-master
killbill_client: trivial cleanups

Signed-off-by: Pierre-Alexandre Meyer <pierre@mouraf.org>