Streamlined /me

Added the asterisk found in the "/me" command on the official Minecraft server implementation.

Replaced the for loop concatenating the message with a Lua function call to achieve the same effect with less code.

Completely redesigned the 'if' calls, to prevent unnecessary code from running.
Small tweak to table.concat
Merge pull request #77 from isavegas/patch-1

Streamlined /me