Changed crudFlag to attribute node in schemas
Added network id to split ratio
SplitRatio-related tests
Merge branch 'master' of github.com:calpath/model-objects
removed CrudFlag on SplitRatioSet
Made SplitRatio and SplitRatio profile Comparable so I could sort them by id during testing
Merge pull request #69 from sean-morris/master

Testing related to SplitRatio-related classes