SpringAtom - #64

- validating the appointment begin created in the wizard
in external validator out of the wizard scope (while it is still caled by Webflow mechanism)
- added validation againts the car (its owner)
SpringAtom - #127

- SA.wizard.renderNotification is, at the moment, handles displaying notifications. The case is to provide appropriate literal containing text of the message, severity (INFO,ERROR etc)

- added the tag that produces such notification for wizard