Obtain MTP Device information from qt-mobility:
- Serial No. - QSystemDeviceInfo::imei()
- Device Version - QSystemInfo::Version(QSystemInfo::Firmware)
- Manufacturer and Model from QSystemDeviceInfo::[manufacturer()|model()]
- Use defaults from deviceinfo.xml if value not available
Fixes Nemo#603.
Merge pull request #7 from samposa/Nemo603

Obtain MTP Device information from qt-mobility - Nemo#603