Recognise NVME devices (#755022)

Add a pattern to recognise Non-Volatile Memory Express devices as valid
devices to work with.  Devices are named by the Linux kernel device
driver like /dev/nvme0n1 [1] with partitions named like /dev/nvme0n1p1
[2].

[1] linux 3.3 drivers/block/nvme.c nvme_alloc_ns()
    https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/drivers/block/nvme.c?id=v3.3#n1351

[2] Contents of /proc/partitions for a partitioned NVME device
    $ grep nvme /proc/partitions
     259        0  390711384 nvme0n1
     259        1        977 nvme0n1p1
     259        2   31250000 nvme0n1p2
     259        3  328209496 nvme0n1p3
     259        4   31249408 nvme0n1p4

Bug 755022 - gparted doesn't recognize nvme devices