Added world.event() and game.emitEvent().
Example use of emitEvent and event() for drop mirror.
Enter room. Not really tested. s/really//;
Merge branch 'master' of https://github.com/asyncjs/nodeventure

Conflicts:
	world.js
	world/inventory_commands.js
	world/switzerland.js
Merge branch 'master' of github.com:asyncjs/nodeventure