Minor refactoring to ambient rgba canvas draw.
Added debug message for ambient illumination rgba color.
Testing sunrise color. Extended linear opacity sunrise transition with linear rgb color transition.
Extended linear opacity sunset transition with linear rgb color transition.
Added sources' links to plugin description.
Converted hardcoded rgb for sunrise and sunset to configurable properties.
Modified brightness_night property to night_color.a.
Minor refactoring to ambient overlay variables.
Updated configuration section of readme to reflect latest changes in plugin.
Updated sources' links in readme.
Merge pull request #7 from chessmasterhong/color-transition

Added color transition to sunrise and sunset.