Fixes for guiser interaction with armor, alerts

[nearbear]

For: #22

• Fixed guiser going thru armor immunity. It was the same bug in nature as the turncoat bug from Fixed turncoat guiser kill interaction #1782 so I tried a different approach to fixing it this time. The dominates check for identity stealer should no longer cause immune events.
• Fixed alerts being given to the wrong player when guising occurred; swapIdentity now additionally swaps the recipients of alerts that are presently queued.
• Added some guiser tests. The sockets.js change supports this because it's a necessary function for swapIdentity.

Tested the alerts issue locally by having the gunsmith give a gun to a cop then verifying that when they were guised, the dead player received the alert for the gun and not the guiser.