Fixes gh-45.

Conflicts:
	src/recovery.cc

Conflicts:
	test/box/lua.result
	test/box/lua.test
	test/lib/sql_ast.py

Fix https://github.com/tarantool/tarantool/issues/44

Provide open_memstream() implementation for system which
miss it (Mac OS X).

Conflicts:
	src/lua/init.cc
	test/box/lua.result
	test/box/lua.test

A copy-paste implementation of print(64 bit number)
used to add an extra newline at the end of printed string.

Conflicts:
	test/box/alter_limits.test.lua

When looking for the next xlog to recover from, take
into account gaps in LSNs which may occur due to wal_write()
failures.

Add test coverage for create/drop space and error injections.
Add cleanup to alter_limits.test

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

Fix a crash when box.fiber.find() is called with no arguments.
Add a check for empty Lua stack.
Add a test.

2. modify errmsg
3. rewrite Lua - check_type
4. Move try-except importerror to test_suite file