Added MRML node to store module parameter - save and load with scene is successful. Still need to calculate registration without requirement to setup module.
Fixed fiducial registration wizard node importing an exporting using new mrml node referencing mechanism.
Cleaned up several function in the fiducial registration wizard node.
Observe only fiducial lists for modified events.
Merge pull request #2 from mholden8/master

Fixes #1: Module parameters are stored in a MRML node.