Add resize module (#451)

* added resize module - without test

* Added resize test, deleted unused value in blend test (which I've added before)

* Fixed test

* Fixed test

* added modules file

* added imagejs to package

* removed test - not able to check width and height of the element

* Changed resize calculations

src/Modules.js

@@ -24,4 +24,5 @@ module.exports = {
   'histogram': require('./modules/Histogram'),
   'gamma-correction': require('./modules/GammaCorrection'),
   'convolution': require('./modules/Convolution'),
+  'resize': require('./modules/Resize')
 }