Added plugin.yml, TimeExpired.java and TimerThread.java

TimerExpired = Event called when three Minecraft months have passed

TimerThread = Counts up from 0 to 92 (to three months) then calls
TimerExpired then starts again.

Plugin.yml = Needed this to run the plugin (Vey basic, needs to be
completed completly)
Merge remote-tracking branch 'origin/master'