Addon doesn't reload properly without restarting Blender

[Andrew Palmer]

Apparently, only the init script is reloaded when using "reload scripts" in Blender, so changes to submodules are not found until Blender is restarted. It should be possible to solve this using the information on this page: https://blender.stackexchange.com/questions/28504/blender-ignores-changes-to-python-scripts/28505#28505