Update README.md
Actually show the link.
Use the median, average means nothing when a single call takes forever.
Remove erroneous demo about Put.
Implement Nigel Tao's comments [1].

[1]: https://groups.google.com/forum/#!msg/golang-nuts/MGtN3w48IF8/0_N15e9lVRsJ
Merge branch 'master' into proto