Create flixel-demos repository #220
Description
In order to test Flixel changes, it's quite useful to have a centralized place with several demos. Right now those demos are spread in several repositories. Some of them have been forked under the FlixelCommunity organization, e.g. Mode and AS3-FLX-BunnyMark.
My ideia is to create a new repository named flixel-demos, following the same structure used by HaxeFlixel demos. This new repository would contain all demos organized in folders. It will help us test Flixel during its development and it will help Flixel users with examples they can read to understand/learn Flixel.
This new repository will also help the writing of learn.flixelcommunity.org.