GUI-63: Snapshot detail page and CRUD operations (GUI-187).

Includes the following CRUD operations from GUI-187…
- create snapshot
- delete snapshot
- create volume from snapshot (re-use create volume, pre-populating snapshot)
- manage tags (re-use tag editor)

Does not include the following (waiting for image detail page to be completed)…
- register as image

Also includes some style changes for the dashboard, but don't worry about those for now since the dashboard will continue to evolve.