Remove unnecessary models

* The web application is now client that consumes the API
and all models now reside there
Remove irrelevant tests and test data
Remove unused view files
Fix: undefined variable error
Remove unused controllers
Fix: undefined property error

* Changed the "$this->riverService" references to "$this->river_service"
Cleanup schema creation script

* Only leaving the authentication and plugins tables. The rest
of the schema objects reside on the API
Merge branch 'integration-dev' into cleanup-dev
Fix: prevent user from deleting assets they don't own

* The checkbox should not be displayed where the currently
logged in user doesn't own an asset (river/bucket)