Sun over sea with time of day

Gives the effect of the sun moving over the Earth as time moves by.

Initially creates three SVG images, one occupying the screen, and the other two off canvas (to the left and right respectively). When the hour is updated, these background images move along with them.

Currently, there are no transitions, and the initial position will need to be adjusted (as there are issues with time zone atm). Tickets will be added for these two things.