Change the save parameter for call operation methods to be defined by the name of the target pin since this is independent from the operation definition.
Add unit test to validate that the return value of a class method can be assigned to a temporary user defined variable.
Add guard around the call to generate save value.
Merge branch 'master' of github.com:uiuc-cs428/uml2ruby into change_save_param
Return parameter comments for activity diagram methods were not being printed as expected.  Add some structural comments to activity.mtl.
Merge pull request #105 from uiuc-cs428/change_save_param

Change save param