In the new Objective C 2.0 runtime, class Object was trimmed
and no longer contains + alloc, - init, - free and - subclassResponsibility,
which we use.

Implement our own base class and use it instead of the old Object.

This should fix compilation with gcc 4.7 everywhere and clang on
Darwin.

The current code can still be built with gcc 4.6.

macosx2: merging in (manually) previously unmerged changes (from macosx-port1), non-working tests: box/lua.test, box_big/lua.test connector_c/xlog_rpl.test

A fix for Bug#1017905 "replication failure may leave garbage in the read
buffer".

No test case since this is a runtime error which is hard to emulate.

Clear the read buffer whenever closing a file desriptor, to remove
garbage data from the closed connection.

A fix and a test case for Bug#898198 memcached protocol isn't
case-insensitive.

Make the protocol case-insensitive.
Fix the test framework to be able to match case-insensitive server
queries.
Add a test.

Conflicts:
	mod/box/box.lua

A fix for Bug#987296 "cmake doesn't rebuild all files...
which include TARANTOOL_CONFIG".

Since the dependency between recompiled sources and tarantool
module config is not present anywhere in the code, cmake can
not track it.

Add an explicit object_depends to the relevant target.

Fix alignment of tarantool_mod function.

Tarantool/Box crashed during shutdown if a non running LUA fiber
was created.

Fiber garbage collection in Lua, initiated during shutdown,
was performed after the fiber subsystem was destroyed.

Additionally, fix a wrongly formulated assert which checks
that the fiber which is being cancelled has not been
cancelled already.

Darwin revealed a bug in our free_proc_title() function, which was
added to procitle.c to work well with valgrind: we free argv pointer
even if it wasn't allocated (none of PS_USE_CLOBBER_ARGV/PS_USE_CHANGE_ARGV
was set).

Don't free memory if it wasn't allocated.

Another issue is understanding why Darwin doesn't define
PS_USE_SETPROCTITLE and why our FreeBSD port didn't hit this bug.

(https://blueprints.launchpad.net/tarantool/+spec/lua-builtin-size-of-subtree)