Exceed limit results

[maximvl]

Hi guys, as I can see here https://github.com/etsy/hound/blob/203bd0c7601e28de8c4ae4e922bc0b76938af268/index/index.go#L198 - results are just dropped if they exceed limit (which is constant - 5000).

It is possible to return what was collected so far, instead of just dropping everything. Or, alternatively you can let user set max number of results he wants, of course limited by server's limit too.

For me both are better than what we have now, what do you think?