Renamed display function.
Renamed _parseSensorsTemperatureLine function, added line parser parameter.
The items variable holds only temperature related data.
Added fan rpm reading.
Add a separator between temperature and fan rpm if both are displayed.
Added preference for displaying fan rpm.
Added voltage reading.
Added preference for displaying voltage.
Merge pull request #46 from adrianbroher/sensors-ext

Add voltage and fan RPM to display.