Fix flash message layout adjust for ng-hide/show

See change from `ng-if` to `ng-hide` in 288a8a74.

Signed-off-by: Alex Coles <alex@alexbcoles.com>
Re-implement broken flashMessage directive tests

Marked as pending in f99b3619.

Signed-off-by: Alex Coles <alex@alexbcoles.com>
Update angular-context-menu to 0.1.9

Includes support for Angular 1.3. See:
https://github.com/finnlabs/angular-context-menu/commit/140737d1f6c66f8d0cbcf75d0189a93133962985

Signed-off-by: Alex Coles <alex@alexbcoles.com>