Fixes #96
Refactor population file progress bar to handle importing from files in the workspace for issue #85
Finished Download and Delete links for Populations.  Made file list, download, copy, delete, generic to file extension.  Closes #85
Basic architecture for Listing model entries for #74 and #78
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