Check if battery is installed for Batter-Plugin
Created an example runner.py file
Don't show 'mb' twice in Memory-Plugin
Revert "Added ESSID Plugin and some minor bugfixes"

This reverts commit 1c6f9f7c453b2021090678aa4124f4a7ccc48942.
Merged commits from okin
I can't merge. sorry for that :(
Added the ESSID Plugin again and fixed some Errors. Now everything should be fine.
Added changes from okin for Battery Plugin
Moving everything into an subfolder for using relative imports.
Fix problem from merge.
Changing this for the relative import.