Use jimp-compact over jimp

lib/Potrace.js

@@ -1,6 +1,6 @@
 'use strict';
 
-var Jimp = require('jimp');
+var Jimp = require('jimp-compact');
 var Bitmap = require('./types/Bitmap');
 var Curve = require('./types/Curve');
 var Point = require('./types/Point');

lib/types/Histogram.js

@@ -3,7 +3,7 @@
 // Histogram
 
 var utils = require('../utils');
-var Jimp = null; try { Jimp = require('jimp'); } catch(e) {}
+var Jimp = null; try { Jimp = require('jimp-compact'); } catch(e) {}
 var Bitmap = require('./Bitmap');
 
 var COLOR_DEPTH = 256;