Fix #72: print() in background fiber hogs fiber gc memory pool
Add filter to pass tests under OpenVZ. #91
Merge branch 'gh-72-print-palloc-memleak' into stable
Replace luaL_Buffer with tbuf. Fix #65
Merge branch 'stable'

Conflicts:
	include/palloc.h
	src/box/box_lua.cc
	src/lua/init.cc
	test/wal/lua.test

This commit also converts Lua bindings for MsgPack to C++ because they
requires tbuf and region guard.