Perhaps mds.js should in some way handle numeric.js exceptions

[bertvandepoel]

I just hit a case where after 50 iterations, the SVD still hasn't converged in numeric.js. This results in an exception being thrown https://github.com/sloisel/numeric/blob/master/src/svd.js#L212

I know you're probably not expecting many people to be using this, but mds.js saved me from gonum dependency hell, so I'm quite happy with it. So first of all I'm not sure if you even want issues and/or PRs. Second, I'm not sure if mds.js should handle these exceptions in some way or not. I guess it should at least indicate to potential users they might need to catch and handle that exception?

Feel free to ignore this if you don't feel like it. I just thought I'd do my fair share and at least let you know about it.