Make a variable local.

Change-Id: I38b9a5ec2ba6524dae554437e11e6dc37b3c7f94
Tidy imports.

Change-Id: I5e94b0d4d18532147d41a3f947f8f95c7d747eb0
Expose media-consent and withdrawal statuses.

These related to issues #30 & #40, which I plan to resolve shortly.

Change-Id: I3b338c8c7829d0905e66b9e21b7d659f9e8ab942
Fix #30: Show media-consent status.

If a user has given media consent, then this is now shown by an
additional camera icon to the left of their listing in the college
users list.

Change-Id: I1a099917d136f1187d07cea8fdca259a009ec6ab