updating scrape and render scripts to work with new EC2 types and the ne...

Hi,

I like this tooI a lot. I have updated the scrape and render scripts to work with new EC2 web page (issue #75). There are still some missing info -

Changes / known issues:

* Fetching basic info from current generation instances and previous-generation pages
* Previous generation instances pricing are fetched from /pricing/1/ec2/previous-generation/{linux|mswin}-od.min.js
* ECU and Arch are no longer available from the web page and so not covered here
* Some prices for Windows instances are missing