Firework damage ignores friendly fire

Firework damage currently ignores friendly fire, allowing you to kill others on servers even in peaceful zones. Even if you can't physically place blocks like lava.

To test it do:

/scoreboard teams add Temp

/scoreboard teams option Temp friendlyfire false

/scoreboard teams join Temp @a

/give @p minecraft:fireworks 1 0 {Fireworks:{Explosions:[{}]}}

Make sure other player has a block over them, and summon fireworks on them.

I have not tested it with the server property settings, though I imagine that would result in the same thing.