Update docs for 1.7 release

Signed-off-by: Wincent Colaiuta <win@wincent.com>
Doc: correct time scale in TIPS section

This was originally about 10 seconds, and then I switched to the JSON
protocol and it got an order of magnitude better. (There is a binary
protocol that will make it likely faster still, but I haven't gotten
around to implementing that yet.)

Signed-off-by: Wincent Colaiuta <win@wincent.com>