mvcc-catalo-gsnapshots-and-toptransactioncontext (patch 1 of 1)

'git apply --summary --stat --apply --verbose' output was:

 src/backend/utils/cache/catcache.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

For original context, see http://www.postgresql.org/message-id/20130712094223.GK27898@alap2.anarazel.de
Adding travis.yml