Adds placeholder banner button class for ads. Refs #9.
Adds record my position banner. Refs #9.
Adds submarine hunt banner. Refs #9.
Adds electric hands software banner. Refs #9.
Adds nimrod banner. Refs #9.
Adds mobile seohtracker banner. Refs #9.
Rotates banners with delay. Refs #9.
Implements cross fading of banners. Refs #9.
Adds urls to banner clicks. Refs #9.
Serializes add position to avoid repeating. Refs #9.
Documents task in changes log. Refs #9.
Merge branch 'feature/t9_ads'