Initial commit for weather branch. Added barebones plugin.
Added snow generator to weather system.
Added condition trigger (user set) to snow.
Added rain generator to weather system.
Updated readme.
Added fog generator (experimental) to weather system.
Added clear weather for weather system.
Added weather buttons for quick testing weather conditions.
Fixed bug with weather not transitioning correctly when maximum particles reached.
Added random raindrop weight and snow particle size.
Added random particle lifetime.
Merge pull request #1 from chessmasterhong/weather

Merging weather system to day/night plugin