Merge branch 'master' into user-guide

.gitignore

CMakeLists.txt

README

cfg/CMakeLists.txt

cfg/prscfg.c

cfg/tarantool_box_cfg.c

cfg/tarantool_feeder_cfg.c

cfg/warning.c

cfg/warning.h

cmake/check_objective_c_compiler.cmake

connector/c/client.c

connector/c/client.h

core/CMakeLists.txt

core/admin.m

core/coro.m

core/diagnostics.m

core/errcode.c

core/exceptions.m

core/fiber.m

core/iproto.m