New icon for admins

[downey (Michael Downey)]

for @codinghorror for the new shield admin icon.

The really set the wrong tone, IMHO.

https://github.com/discourse/discourse/commit/01853fb9d336295666d03ab0f37bf2e5a9a65843

[codinghorror (Jeff Atwood)]

Great! The trophy always bugged me too.

[elberet (Jens Maier)]

Wildly off-topic, but where can I buy that mini and can I get one with a different weapon? I need it for… uh… historical research. Yes. Research.

[fysics (Zane Beckman)]

Love the new icon. I noticed it last night.