Made the delete confirmation chain generic and implemented across Population, Scenario, and model for #74 #78.
Fixed a minor bug where auto-urls were overriding custom urls.
Added blue banner and CSS for #74.
CSS tweaks for title.
Implented sub-model listings for #74
Placed Relational and Probability Functions together on one page.
Collapsing behavior working for #74
Final touches on model_list accordion.  Closes #74
Minor Styling
Greatly simplified flipping collapse icon
Merge branch 'master' into production
Added delete option for Units.  Fixes #72
Active link coloring filter.  Fixes #83
Started work on Many-To-Many widget.  #77
Working set widget  #77
Basic rendering of the new table. #77
Update_date() with (some) of the correct select values.  #77
MtM Widget is working but needs refactor around <th>
Widget working again with new <th> labels#77
minor