[travis] Output tests results after the build

Also tag code with build number, because on clean environment, travis
fetches with depth 50

Change-Id: I7e46af68479e39a488a58150327ee3b785531a05
Reviewed-on: http://review.couchbase.org/28453
Reviewed-by: Matt Ingenthron <matt@couchbase.com>
Tested-by: Sergey Avseyev <sergey.avseyev@gmail.com>