Finished permits CRUD

Finished implementing update permit feature, some minor backend
changes, renamed `site_pages` to `site_authorization`
Cleaned up permits page

Added accordion collapse, added user-level permits
Finished group management page

Allows you to create groups, delete groups, change group name, home
page, and set default groups and default primary group.
Merge pull request #8 from alexweissman/butterflyknife

Butterflyknife