playable demo v2

[ulikk]

For the first iteration of the prototype, i propose to rewrite the first milestone. The following points have to be done:

• [x] restructure folders, create a output directory that contains past milestones and a working directory structure for source/assets
• [x] rewrite the current "engine" to coffeescript, create a grunt build task, dependency to pixi.js
• [ ] create a design document for a first "level": ship / weapons / enemies / background
• [ ] implement first level

[ulikk]

Just a small note for what the second prototype should contain:

• a background, consisting of several layers of graphics (vines, stones), the layers might be afflicted by a displacement shader to achieve a "wobbly" effect
• the ship, having a light cone in front which lights the surroundings and bubbly particles moving from the back. The light cone should modify the color values of the background layers; ouside the light cone, the background is tinted blue-ish, inside the light cone, the background will get its normal color