Merge remote-tracking branch 'origin/master' into 1.6

doc/sphinx/book/box/authentication.rst

doc/sphinx/book/box/box_index.rst

doc/sphinx/book/box/box_schema.rst

doc/sphinx/book/box/box_space.rst

doc/sphinx/book/box/limitations.rst

doc/sphinx/book/connectors/__c.rst

doc/sphinx/book/connectors/__perl.rst

doc/sphinx/book/connectors/__php.rst

doc/sphinx/book/connectors/__python.rst

doc/sphinx/book/connectors/index.rst

doc/sphinx/book/replication/index.rst

doc/sphinx/reference/fiber.rst

doc/sphinx/reference/json.rst

doc/sphinx/reference/shard.rst

doc/sphinx/reference/yaml.rst