added base models
Added creator and assignee user objects and creation/modification date
objects to the requirement model class.
added methods to the other model classes for Gson dependencies if
needed.
removed unused imports from the requirement model and added some TODO
comments.
Testing to see if Git is fixed
Added field TODOs and implemented toJSON in Note and Task
GUI organized to look a little prettier, fields made public, tab added
Added combo box
Takes care of conflicts between this and dev-model
Merge branch 'dev-models' into dev-feature-controllers
Updates to take of another conflict
Merge branch 'GUI' into dev-feature-controllers
All the code should now be updated to match with the recent changes to the RequirmentModel format