Resolve "Remove user view "subjects" and add user view fields to resources"

Related to #712 (closed)

Summary:

Models/Migrations

• Create user view table and model
• Create join table resources--user views
• Create join table allocations--user views
• Add user views to resources
• Add user views to allocations

Views

• UserViews CRUD pages
• Resources show/edit pages
• Allocations show/edit pages
• Add User Views to left sidebar

Controllers

• Create user view controller
• Add user views to resources params
• Add user views to allocations params

Routes

• Create user view resource routes, e.g., http://localhost:3000/user_views/1/edit

Data migration

• for subject categories in resources/allocations
  • add user views for elementary, middle, highschool
  • remove those subject categories

Specs