Load storage URL as trusted source

- Due to AngularJS' Strict Contextual Escaping (SCE) mode (enabled by default) blocking loading the storage url resource when testing locally, now wrapping `scope.storageUrl` in `$sce.trustAsResourceUrl()`
- In `storage-selector.html`, correcting id value to be `storage.html` and ensured reference in directive also.
Merge pull request #9 from Rise-Vision/chore/trusted-storage-url

Load storage URL as trusted source