alter-table-lock-strength-reduction-patch-is-unsafe (patch 1 of 1)

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

 doc/src/sgml/mvcc.sgml                    |    8 +-
 doc/src/sgml/ref/alter_table.sgml         |   62 ++++++++++++++-
 src/backend/commands/tablecmds.c          |   43 +++-------
 src/backend/commands/trigger.c            |   12 +--
 src/test/regress/expected/alter_table.out |  121 +++++++++++++++++++++--------
 src/test/regress/sql/alter_table.sql      |   29 +++++++
 6 files changed, 198 insertions(+), 77 deletions(-)

For original context, see http://www.postgresql.org/message-id/CA+U5nM+za1mX5kTy-y+iUf1Acir4w70kHbBeedJ2iijpE5mJvg@mail.gmail.com
Adding travis.yml