Data file path configuration

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The default world is loaded from a hard-coded path "world.json"
A better name would be "default-world.json", but beside that, it should be configurable.
You should be able to place worlds in a "worlds" folder, for instance.

Similarly, the animations for an entity are loaded from "animations/.json"
You may want to store these elsewhere.

skele2d/source/Editor.coffee

Line 275 in 21d3d1a

req.open("GET", "world.json")

skele2d/source/base-entities/Entity.coffee

Line 25 in 21d3d1a

EntityClass.animation_json_path = "./animations/#{EntityClass.name}.json"