talks: add 2015/simplicity-is-complicated, r's talk at dotGo 2015

Change-Id: I6d96dd63e35fb7e87d65d209328c798c8be0f3d5
Reviewed-on: https://go-review.googlesource.com/17265
Reviewed-by: Russ Cox <rsc@golang.org>
7 files changed