Fixed cannot save because no epoch group error
Removed update button from background control
Fixed display of units on z axis in edit parameters window
Added normalized unit support to background control and edit parameters
Allowing setDeviceBackground without specifying units
Updated example protocols
Fixed error message in background control
Added isValid parameter property
Added stubs for calibrated device
Merge pull request #60 from Symphony-DAS/1.4.0

1.4.0