Merge pull request #34 from mnjuhn/master

Serialization Util Added
Set up read methods for lists of Split Ratios
Added DemandSet model object and moved DemandProfile to scenario per Matt's request
Moving DemandProfileFactory to scenario
Added comments
Re-factored SplitRatio-related classes to not use maps
Merge branch 'master' of github.com:alexeygoder/model-objects
Merge branch 'master' of github.com:sean-morris/model-objects
Adding joda time date format compatibility and unit test.