Merge pull request #55 from Farsx/master

Allow selection of the temperature sensor to be shown in panel
Fixed hddtemp daemon detection when executable is not in user's path
Replaced _get(Min|Max|Crit|High|Crit) with inline regexp.
refactored project name, configuration etc. from cpu-temperature to sensors [#57]
updated README with new project name and links
Added screenshot to README.
Fan speed and voltages are now selectable sensors to display in the panel.
Removed radio boxes for average and maximum temperatures, items moved to
the combobox.