Battery plugin
Added funtionallity for when battery is disabled using flag. (BATTERY_DISABLED)
Added functionallity to specify what function/program that should be run if disabled BATTERY_DISABLED_CMD
Added default BATTERY_DISABLED_CMD and an Example.

history.zsh
* Saves history in .historydir/$hostname.history
* bumped up the default saved items.
* moves old zsh_history to new location to preserve history