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

doc/user/data-model.xml

doc/user/persistence-architecture.xml

doc/user/preface.xml

doc/user/stored-procedures.xml

doc/user/tutorial.xml

src/box/hash_index.cc

src/box/index.cc

src/box/index.h

src/box/lua/box_net.lua

src/box/lua/call.cc

src/box/lua/index.cc

src/box/lua/schema.lua

src/box/tree_index.cc

src/box/tree_index.h

test/big/iterator.result

test/big/iterator.test.lua

test/big/lua.result

test/big/lua.test.lua

test/big/lua/utils.lua

test/big/sql.result