added requirements file for easy setup.
Do not crash if no battery is present.
Added possibility to show free ram.
Free memory is now colored yellow if <25% free and red if less then 10%.
Revert "Added ESSID Plugin and some minor bugfixes"

This reverts commit 1c6f9f7c453b2021090678aa4124f4a7ccc48942.
Merged commits from okin