Using fail instead of assertTrue in unit tests.
Merge branch 'master' of github.com:calpath/model-objects
Merge pull request #100 from mnjuhn/master

Unit test change, using fail instead of assertTrue for caught exceptions
added getFundamentalDiagramProfileBySensor method to FundamentalDiagramSet model object
fix to comments
Merge pull request #101 from gunesder/master

added method to FundamentalDiagramSet object