[#80256282] Adds admin privileges and staff route
 - session controller queries for user and adds isAdmin property
 - adds hasRole static model method to check user roles
 - adds staff route
 - adds bethelStaff policy
 - blocks access to /user list route
 - removes white space throughout

Signed-off-by: Josh Gillespie <josh@astonishdesign.com>
[#80256282] Restricts access to /user route if not admin

- Comments out rest: false in user controller config (was restricting
access to /user)
- Modifies platformStaff policy to check if admin without .hasRole
- Sets isAdmin property in session controller to use check in policy
- Removes trailing spaces throughout
[#80256282] Grants unique privileges to staff

- Adds Staff module to app.js
- Adds staff nav link
- Adds user management controller
- Adds user list to /staff view
Merge branch 'feature/admin_privileges_80256282'