Merge pull request #35 from mnjuhn/master

Adding another Serialization Unit and code tweaks
Merge pull request #36 from mnjuhn/master

Adding Serialization Test, Comments and way to ensure only Base JAXB classes are serialized.
Merge pull request #37 from alexeygoder/master

Adding support for the generic writer and moving Demand Set and profile to scenario
Merge pull request #38 from sean-morris/master

SplitRatioSet
Merge branch 'master' of github.com:calpath/model-objects