Restored 'show'
Added property name to error message
Renaming parameters to match 'frame'
More robust handling of partially intialized state on server request.

Still needs line-downsample to work though...
Merge branch 'master' into bugfix/server_downsample
Skip on under-defined for linear downsample
First working draft of repaired line downsample.

Added range_limit parameter to report back range bounds.
More robust line downsample
Merge pull request #960 from ContinuumIO/bugfix/server_downsample

Bugfix/server downsample