Limits user statements on stats page to 500
Limits user statements on stats page to 500

This is a response to Github issue #286. I've set the limit to
500, please feel free to change it. I considered adding the limit
as a constant, but decided against it as this is the only place
it's likely to be used.

studio666/gratipay.com,bountysource/www.gittip.com,gratipay/gratipay.com,gratipay/gratipay.com,gratipay/gratipay.com,MikeFair/www.gittip.com,mccolgst/www.gittip.com,studio666/gratipay.com,eXcomm/gratipay.com,eXcomm/gratipay.com,eXcomm/gratipay.com,MikeFair/www.gittip.com,bountysource/www.gittip.com,studio666/gratipay.com,studio666/gratipay.com,MikeFair/www.gittip.com,bountysource/www.gittip.com,mccolgst/www.gittip.com,mccolgst/www.gittip.com,eXcomm/gratipay.com,gratipay/gratipay.com,bountysource/www.gittip.com,mccolgst/www.gittip.com