Use (baseDirectory in root).value instead of root.base

Follow up to scala-js/scalajs-cross-compile-example#1
Merge pull request #66 from gzm0/fix-cross-compile

Use (baseDirectory in root).value instead of root.base
added play-scala.js showcase
Merge pull request #67 from hussachai/master

added play-scala.js showcase
Update version of uPickle and Autowire
Merge pull request #68 from lihaoyi/patch-1

Update version of uPickle and Autowire
Version 0.5.3.
Merge pull request #69 from sjrd/release-0.5.3

Version 0.5.3.
Make the distinction of javalib-ex a bit clearer.
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