Link to benchmarks when we talk about the perf

I figure anyone who reads about the 1.3-3.3x speedup would want to see some examples =)
Merge pull request #70 from lihaoyi/patch-2

Link to benchmarks when we talk about the perf
Updated versions of scalaz, monocle, scalajs-react
Merge pull request #71 from japgolly/master

Updated versions of scalaz, monocle, scalajs-react
Fix #64: Document difference of toString on Floats and Doubles
Merge pull request #72 from gzm0/double-toString

Fix #64: Document difference of toString on Floats and Doubles