Conflicts:
	src/box/lua/box_net.lua
	test/box/ipc.test
	test/box/net.box.result

 + memory leak in box.net.box (timeouted responses)
 + remote:ping() never throw exception

Conflicts:
	doc/user/target.db
	src/ipc.cc
	test/box/ipc.test

Conflicts:
	doc/user/stored-procedures.xml

Conflicts:
	src/box/CMakeLists.txt

Conflicts:
	src/lua/init.cc
	test/box/fiber.result
	test/box/fiber.test
	test/module/net_sql.mysql.result
	test/module/net_sql.mysql.test

Closes #161

Conflicts:
	.gitmodules
	CMakeLists.txt
	extra/rpm.spec.in
	src/CMakeLists.txt
	src/box/box.cc
	src/box/box.h
	src/log_io.cc
	src/recovery.cc
	src/tarantool.cc
	test/unit/CMakeLists.txt
	test/unit/test.c

Fix styler
Clarify tricky pieces of the code (at least make them clearer to yours
truly).
Fix a bug with incorrect return value from fwrite() & O_DIRECT.

This fix adds virtual method raise() to Exception classes to throw
derived type instead of base.

This patch explicitly saves Exception to a thread-local variable inside
struct cord on tnt_raise(). This variable can be used to safetly
re-throw last exception from any place (not only from catch() block).
This technique requires exception to be thrown and catched by pointers.
tnt_raise macros was rewritten and all 'catch (Exception &)' blocks were
substituted with 'catch (Exception *e)'.

This patch also adds a new feature to box.raise() function.
When called without arguments box.raise() re-throws last exception (if
any).

These changes needed to implement proper handlings of exception for FFI
calls.