Teleport 'warmup' time - delay before teleport

Closes #507.

War now includes a configuration option "TPWARMUP" to add delays
before teleporting players to a war. This can be used on full-world
PvP servers to prevent players from running away from a fight.

The configuration option is specified in ticks - 20/sec.

The delay is activated for /zone and /warhub.

@taoneill @cmastudios documentate for 1.9 release.