Added initialization of attributes to their assigned type.  Currently
causes problems with bi-directional or looping associations.
Adjust association/navigability model and test to avoid circular
ownership.
Fix handling of built-in types (string, fixnum, real)
Merge pull request #65 from uiuc-cs428/Iteration4_attributes_associations

Iteration4 attributes associations
Merge branch 'master' of https://github.com/uiuc-cs428/uml2ruby into big_diagram

Conflicts:
	acceleo/src/acceleo/main/generate.mtl
	acceleo/testing/dependency/autogen/Wheel.rb
rewrite dependency unit test