Collision Detection

Uses the `Landscaper` class to add objects in a landscape array as obstructions on the map. Currently only works with SVGs. Add obstructions to the map by adding objects to the `lib/landscape.coffee` array:

```coffee
module.exports = [
  id: "rock1" # adds ID to DOM element
  src: "/images/circle.svg" # src of the SVG file
  x: 100 # left position
  y: 300 # top position
,
  id: "dew"
  src: "/images/dew.svg"
  x: 350
  y: 350
]
```