libobjc2 has a notion of "small objects". The type
of a small object is detected by checking its address:
it should not be word-aligned.

When performing a custom memory allocation for Request,
make sure it's not a small object, by aligning it around
(void *) pointer (word) boundary.

object_dispose in libobjc2 runtime doesn't check whether
the passed in object is nil, so check for nil outside.

Add a makefile to libobjc.

See README in this patch for a description of the import
procedure.

Fix a typo in the code which would move the code
to the Objective C 2.0 runtime. Correctly check
for the size of area necessary to store the object (vs.
allocated area) to make a decision whether or not we
need to re-allocate.

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