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

doc/www/content/doc/box-protocol.rst

doc/www/content/pages/index.rst

extra/schema_fill.lua

src/box/alter.cc

src/box/bootstrap.snap

src/box/box.cc

src/box/engine_sophia.cc

src/box/engine_sophia.h

src/box/lua/load_cfg.lua

src/box/lua/schema.lua

src/box/sophia_index.cc

src/errcode.h

src/lua/box_net_box.lua

test/box/access.result

test/box/access_bin.result

test/box/access_bin.test.lua

test/box/access_misc.result

test/box/access_misc.test.lua

test/box/admin.result

test/box/bootstrap.result