Doc: Update ChangeLog

Signed-off-by: Tim Serong <tserong@suse.com>
Misc: Cib model: Ensure orphaned resources with same ID as clone parent are ignored (bnc#834198)

Signed-off-by: Tim Serong <tserong@suse.com>
Build: Exclude rails-2_3 and sle-11-sp2 branches from travis-ci

Signed-off-by: Tim Serong <tserong@suse.com>