Voted by team

All functions exception *_ex() in src/lib/small are non-throw.

Please be careful - only _ex versions throw OutOfMemory in lib/small.
All other function must be checked for NULL return!

Affected prefixes:

 * ibuf_
 * obuf_
 * region_
 * mempool_
 * smalloc_

Allow to use tarantool/small library in modules.

Conflicts:
	src/fiber.h
	src/lib/small
	test/app/module_api.c
	test/app/module_api.result

Make sure we don't duplicate declarations in multiple places.

Save developers time on debugging stored procedures.
Closes #1100.

Thanks Vyacheslav Egorov for the fix in LuaJIT.

Update third_party/luajit to v2.1 as suggested by Vyacheslav Egorov.

Replace copy-pasted code by calls to LuaJIT internal API.
Remove useless memset(). Remove size argument from luaL_pushcdata().
Add comments and try to make this stuff to be more clear.

Performance boost up to 10% on cbench

Please never use lua_pushinteger for numbers >= INT32_MAX

Base class defines it with const qualifier.

If building for 32 bit x86 target pass -march=i686 option to enable
atomic instructions.  i686 is usually the default arch but sometimes an
older one is selected (depends on gcc compile time configuration).

Use vclock_sum() from WAL writer as a transaction signature.
Fix handling of transactions without the write requests.