Added Invisibility Support

I was vanished today on the server but when I relogged everyone spammed me with "HELLO! Code this" bla bla bla, So instead of listening to them tell me to code stuff for them - I thought I would modify this to make it so only people who can see hidden information can see the login message of an invisible person. (Also a message saying their invisible)
Added Aliases to the WhoCommand (For those with permission)

Bleugh!
Update NotifyCommand.java
Update Tregmine.java
Update Tregmine.java
Merge branch 'master' of github.com:EmilHernvall/tregmine
Changed semantics of HIDDEN_LOCATION flag
Merge remote-tracking branch 'ldiverse/patch-34'
Killed debug code in WhoCommand
Merge remote-tracking branch 'ldiverse/patch-39'
Polymorphic coloring in NotifyCommand