Ongoing cleanup and refactoring of maps.

lib/pixi/maps/projections/projection.js

@@ -26,7 +26,7 @@ export default class Projection {
      * @memberof Projection
      */
     backward(point) {
-        console.error('You must override the backward fuction in ' + this.name + '.')
+        console.error('You must override the backward function in ' + this.name + '.')
     }
 
     toString() {
@@ -38,6 +38,6 @@ export default class Projection {
     }
 
     get maxViewport() {
-        return { min: new PIXI.Point(-90, -180), max: new PIXI.Point(90, 180) }
+        return { min: new PIXI.Point(0, 0), max: new PIXI.Point(1, 1) }
     }
 }