Had to remove arr.pop() on line 373 in model.js to get this library working

[josephrocca]

This line here was removing the last item from each vector which made their lengths different which caused a whole bunch of chaos down the line (multiplying by undefined).

I have no idea why it's there, but I did notice that it works for the example vector.txt in this project. Maybe something to do with \r and \n?

Also I added this:

if(isNaN(words) || isNaN(size)) {
  throw new Error("First line of input text file should be <number of words> <length of vector>. See example data 'vectors.txt' in repo");
}

After this line since that caused me a lot of trouble (I don't think it's mentioned anywhere in the readme).

Thanks for the awesome library!