Merge branch 'master' of github.com:mailru/tarantool

doc/user/connectors.xml

doc/user/data-model.xml

doc/user/databases.xml

doc/user/server-administration.xml

src/box/lua/schema.lua

src/box/lua/space.cc

test/big/hash.result

test/big/hash.test.lua

test/big/hash_multipart.result

test/big/hash_multipart.test.lua

test/big/iterator.result

test/big/iterator.test.lua

test/big/lua.result

test/big/lua.test.lua

test/big/sql.result

test/big/sql.test.py

test/big/tree_pk.result

test/big/tree_pk.test.lua

test/big/tree_pk_multipart.result

test/big/tree_pk_multipart.test.lua