Improve gnome-clocks world view (pictures, geolocation)

by Evgeny for GNOME

The use of new GNOME 3 design pattern has already been proven to turn the user experience into a pleasure. Working in a close collaboration with the GNOME Design Team the main goal of this project is on one side to improve gnome-clocks world view by implementing the support for custom city images as well as the integration with geolocation and on the another side to use a framework of gnome-clocks App to test and to implement new design ideas.