Muting a player in-game does not mute them form the map

[TomLewis]

Moved from Dynmap: webbukkit/dynmap#1574

Implementing Mute from Essentials into Dynmap.

[mikeprimm]

I think this will be easy to implement - will try to find time this weekend

[mikeprimm]

Added to latest dev build (0.80-SNAPSHOT)