Modify Exert model to link to user profile record.

Adding authentication to list view with template layout.

Create crispy form views and templates.

Adding PRE scores to profile page.
SETTING current PRE to 0 if no records exist for user.

Bootstrap styling for profile page.
Removing squad entity from this branch as temp fix for this long running branch that needs to be merged back to master.

The squad branch has ended up having PRE code, I can't merge back to master without taking functionality that is not complete.

Removing squad code as temp fix to reintegrate branch.  Will revert changes back on branch once merged.