Added a simple linear gradient as the background of the world map.
Get an example with time in action. TODO: fix this so it will work when crossing page boundaries.
Simple scrolling background. Still a lot to be done here though.
Corrected some of the issues with the sun over sea effect.
Use isUndefinedOrNull function rather than explicit check.
Update to the sun effect in the background. Added logic for resizing.
Code tidy up.
Added a comment to clarify where the background gets initialised.
Update initial position of sun so that 12:00 noon corresponds to a position of San Francisco, CA
Make the world turn the other way round.
Updated colours of sun effect on background to blue colours. Updated initial position so be correct for the updated background.
Merge branch 'sun_over_sea_with_time_of_day' of https://github.com/daveallenbpm/ChronoCommit into daveallenbpm-sun_over_sea_with_time_of_day

Conflicts:
	app/js/directives.js
Styling change and updated to use new utilities
Merge branch 'daveallenbpm-sun_over_sea_with_time_of_day'