Easy fix - width and height

[aztecman]

right now the width and height don't behave properly.
For example, it throws an error on 640x512

Problem is simply that you didn't put the arguments in the pipelines
So,
width=width,
height=height,

put these ^ arguments in each call to 'pipe'

Fixed on my local, but I am too lazy to open a PR just now.

[jonahclarsen]

Thanks for this, I was able to create a 640x512 image. However, I get an error with other resolutions, even 648x512. I'm not sure why 640 works but 648 doesn't. I created issue #9 about it, any help would be greatly appreciated.