Read /sys/block/<device>/queue/rotational, so we can check for SSD disks
(SSD device has rotational == 0)
Merge pull request #211 from jsuchome/queue_rotational_info

Read /sys/block/<device>/queue/rotational, so we can check for SSD disks
add travis testing support
Merge pull request #212 from dirkmueller/master

add travis testing support