Merge pull request #43 from Farsx/master

added support for hddtemp as daemon
Minor fix to [Farsx]'s patch
Merge pull request #44 from ametheus/master

Hddtemp daemon fix
0 degree temp ignored; added support for showing max temp instead of average temp
Extended the README file.
invalid temp return by sensors is ignored
Merge pull request #45 from adrianbroher/master

Add more information to the README
updated README
updated README.md
fixed typo in README
added all contributos as Authors
Update README.md
updated metadata for schemas
added preference dialog and schemas
[prefs] enabled saving of data update time
[prefs] enabled saving of Unit
[prefs] enabled saving display-degree-sign and display-decimal-value boolean
[prefs] enabled saving of show average/maximum in panel
[prefs] added display-hdd-temp boolean in preferences
enabled checking of 'display-hdd-temp' preference