key lost in this line when not exactly devided

[happynoom]

ps-lite/src/postoffice.cc

Lines 172 to 176 in 08fb534

	for (int i = 0; i < num_servers_; ++i) {
	server_key_ranges_.push_back(Range(
	kMaxKey / num_servers_ * i,
	kMaxKey / num_servers_ * (i+1)));
	}

this may cause key lost when kMaxKey not exactly divided for the last range end