Upgrade against concert 0.6
Make init more flexible and remove destructor

Don't force the host and port to be class members and
allow motor enabling and disabling
Remove inappropriate I/O methods

They should be part of concert.devices.io package now
Remove send retry from aerotech connection

If the controller is unstable and cannot hold a socket
it is not up to us to fix that
Merge pull request #142 from ufo-kit/aerotech-upgrade

Aerotech upgrade