Add async.resolve() to get result of future lists
Change scan to yield futures instead of one list
Merge pull request #265 from ufo-kit/async-scan

Proposal: asynchronous execution of scans
Add writable property to ParameterValue
Test writable property
Enable stash/restore only for writable params
Test saving for Parameter
Merge pull request #267 from ufo-kit/fix-param-stashing

Fix param stashing for whole devices
Make State a subclass of Parameter

and use the hardware state over the software one
if possible.
Fix state getter on dummy ContinuousRotationMotor