Add rydurham/Sentinel for user / group management
Add view assets for rydurham/Sentinel
Add migrations and database seeds from rydurham/Sentinel so we can customize these.
Add Sentry database seeds
Add provider for rydurham/Sentinel
Update readme with new default user credentials
Add config for sentinel package
Merge pull request #18 from SimpleLance/feature/add-sentinel

Feature/add sentinel