Upgraded canvas to 2.4.1 and ejs to 1.0.0

Author: Tony Dalbrekt

lib/image.js

@@ -49,7 +49,7 @@ var filters = {
 
 function getBoundingBox(diagram) {
     var Canvas  = require('canvas'),
-        _canvas = new Canvas(1, 1),
+        _canvas = Canvas.createCanvas(1, 1),
         ctx     = _canvas.getContext('2d'),
         canvas  = new mdjson.Graphics.Canvas(ctx);
     var boundingBox = diagram.getBoundingBox(canvas);
@@ -63,7 +63,7 @@ function getImageData(diagram, type) {
     boundingBox.expand(rectExpand);
 
     var Canvas  = require('canvas'),
-        _canvas = new Canvas(boundingBox.getWidth(), boundingBox.getHeight(), type),
+        _canvas = Canvas.createCanvas(boundingBox.getWidth(), boundingBox.getHeight(), type),
         ctx     = _canvas.getContext('2d'),
         canvas  = new mdjson.Graphics.Canvas(ctx);