Merge with the master.

cfg/tarantool_box_cfg.c

cfg/tarantool_box_cfg.h

connector/c/client.c

connector/c/client.h

connector/perl/MANIFEST

connector/perl/Makefile.PL

connector/perl/lib/MR/IProto.pm

connector/perl/lib/MR/SilverBox.pm

connector/perl/lib/MR/Storage/Const.pm

connector/perl/t/TBox.pm

connector/perl/t/box.pl

connector/perl/t/box_tree.pl

connector/ruby/README

connector/ruby/box.rb

connector/ruby/iproto.rb

core/CMakeLists.txt

core/admin.m

core/errcode.c

core/exception.m

core/exceptions.m