add-regression-tests-for-role-user (patch 1 of 1)

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

 src/test/regress/expected/role.out |  309 +++++++++++++++++++++++++++++++++++
 src/test/regress/parallel_schedule |    2
 src/test/regress/serial_schedule   |    1
 src/test/regress/sql/role.sql      |  314 ++++++++++++++++++++++++++++++++++++
 4 files changed, 625 insertions(+), 1 deletions(-)
 create mode 100644 src/test/regress/expected/role.out
 create mode 100644 src/test/regress/sql/role.sql

For original context, see http://www.postgresql.org/message-id/CAEP4nAznaKyEcxMrrsQ8RBvDOAeAXE5=V2AsfM8JpLORuCGaPQ@mail.gmail.com
Adding travis.yml