Made animal choice a select box for treatment designations.  Part of issue #46
Merge branch 'master' of https://github.com/davebridges/mousedb
Created test fixtures for experiments, measurement and assay.  Part of issue #33 and #47.
Added view to display data for a particular strain.  Part of issue #47
Added csv views for strain-data and measurement-data.  Part of issue #33.  Closes #47
Added cohort data and csv views.  Closes #44