0.7.4

• User-accessible hardware tests for leds and ears (fix #19)
• More upgrade page improvements
• Use /run instead of /var/run (@clouetb) (fix #86)
• nabboot: disable system led at boot (@Lyokovic) (fix #40)
• Nabblocky with any hostname (fix #92, thanks Framb75)
• Valentine's day sounds (french only, of course)