Motion Blur at any angle

Motion Blue for images at any angle

<pre lang="python"><code>
img = Image('lenna')
blur = img.motionBlur(50,33)
blur.show()
</code></pre>

![b](https://f.cloud.github.com/assets/3823490/398178/daed69b2-a852-11e2-83bc-bdf21305395f.jpg)
![c](https://f.cloud.github.com/assets/3823490/398202/7bde3342-a853-11e2-8ecf-20c72dfc46ce.jpg)