Merge pull request #272 from Nurhashimah/master

#467 - Mileage & Mileage Replacement-Hod Approval tab(show) fixed
#521 Add brand/model/receivedate in show page asset loss
#448 add grade and position to display in new appraisal
Merge pull request #273 from mkamalsaedon/master

#521 Add brand/model/receivedate in show page asset loss
#490 Staff Notifications
enable authorisation
clean up roles index
#485-user roles - minor fixes