[Scenario] Prevent NPE when working with old versions of activities
Merge pull request #47 from VWoeltjen/scenario44

[Scenario] Prevent NPE when working with old versions of activities
Merge pull request #48 from VWoeltjen/master

[Scenario] Follow up on known issues
Merge pull request #49 from VWoeltjen/master

[Scenario] Include fields for duration, start, and end in Info View
[Scenario] Add notes field to activities, decisions

Satisfies nasa/MCT-Plugins#32. Adds a 'notes' field to both
activities and decisions. This allows arbitrary multi-line
text to be attached to these objects, for purposes of
explanation, description, et cetera.
Merge pull request #50 from VWoeltjen/notes

[Scenario] Add notes field to activities, decisions
Merge remote-tracking branch 'nasa/master'