* fix bug in benchmark collection: bad benchmark data key
meant that all the builders collided when writing data.
* report benchmarks even if make bench exits non-zero.
* graphical and json presentations
R=agl1
CC=golang-dev
https://golang.org/cl/201065
These are the scripts behind godashboard.appspot.com. Nothing is
particularly beautiful about it, but it does run.
I still need to add support for per-builder keys and for running the
benchmarks.
R=rsc
CC=golang-dev
https://golang.org/cl/183153