Use explicit method call to set property
Add and use `cancel` method in selected asset model
Add and use `exists` in selected asset model
Create and use `change` method in selected asset model
Remove 'asset:unselected' event
Fix `reset` to `close`
Do not re-render mass transit stop
Fix create new asset
Fix formatting
Merge pull request #255 from finnishtransportagency/asset_form_to_use_selected_asset_model

Asset form to use selected asset model