patch-add-an-ldapoption-to-disable-chasing-ldap-referrals (patch 2 of 1)

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

 doc/src/sgml/client-auth.sgml |    9 +++++++++
 src/backend/libpq/auth.c      |   12 ++++++++++++
 src/backend/libpq/hba.c       |    8 ++++++++
 src/include/libpq/hba.h       |    1 +
 4 files changed, 30 insertions(+), 0 deletions(-)

For original context, see http://www.postgresql.org/message-id/CANkGpBu2EkirC37h=xwLuB+peg8cHoaDX0yXWutsXijMPXLC7Q@mail.gmail.com
Adding travis.yml