Fix 'connected' command for Minecraft/Bukkit 1.6.2.

According to issue #123, the 'connected' command is broken as of Minecraft (Bukkit) 1.6.2. This commit solves the problem in the following way:

Input log in reverse direction to grep, search for first appearance of "players online", print this line and the line before. The line before contains a `", "`-separated list of connected players. Ouput each player name on its own line.

Also, a delay of three seconds before evaluating the log file seems to be over the top. The server should immediately return the answer and write to the log file, so I believe that one second of delay is safe enough.