platformer example

Ok, so this my 1st take on the platformer thing, stripped of jquery, requirejs and ecs stuff. Surprisingly over 300 lines, I thought it was going to be more like 100.

Any way, the platform model / texture is by me, as far as I remember (5 years old). Since I do not remember where that lava skybox was from, I used the skybox that already exist in 3js instead, so no copyright problems for you. Also converted json to v4 as I noticed you said you were going to deprecate v3 somewhere.

For code formatting, I stuffed extra space between () and parameters everywhere, but maybe missed a place or two. I seem to remember @mrdoob was asking for some sublime plugin to format the code into 3js style, did he find one?
Yeah. Well, I'm not super experienced in games, but platformer sounds like something like little big planet or mario 64...