* Added: Disks io stat graphs and a dedicated io mode for disks box

 * Fixed: Better detection for disk io stats including multiple disks for OsX

 * Changed: Terminate, Kill, Interrupt shortcuts now only uses uppercase T, K, I

 * Changed: Process filtering changed to non case-sensitive, patch by @UmarJ

 * Case-sensitive proc filtering using uppercase F

 * Changed: Get CPU load average from psutil module instead of os module, patch by @araczkowski

 * Fixed: Misc bugs