MagicNet for Node.js

Like others I am have been using ConvNetJS in Node.js, server-side.

In order to actually use MagicNet from Node.js given a CSV or similar data, however, one needs to implement preprocessing code like that in automatic.js.

To avoid rewriting such code, in my own experimental branch I separated the preprocessing code out of automatic.js, leaving only the UI layer there. I have tested it and am happy to submit a pull request. But before I do so I want to see if this type of change is wanted and if there any suggestions as far as naming and structure.

Have a look here:
https://github.com/bittlingmayer/convnetjs/compare/master...bittlingmayer:csv
(I based it off of my fork, but if https://github.com/karpathy/convnetjs/pull/49 is not merged it would be easy to rebase.)