Merge branch 'ipc'

doc/user/stored-procedures.xml

include/fiber.h

include/ipc.h

include/rlist.h

src/CMakeLists.txt

src/fiber.m

src/ipc.m

src/lua/init.m

src/lua/lua_ipc.h

src/lua/lua_ipc.m

src/tarantool.m

test/box/ipc.result

test/box/ipc.test

test/box/lua.result

test/unit/rlist.c

test/unit/rlist.result