Added nop and _nop to ReactS.Fix{,T}.
Made ReactS.>> lazy
Added ReactS.liftIO (workaround for Intellij)
Added T[A] to ReactS.Fix{,T}
Releasing 0.5.4
Merge tag 'v0.5.4'

Release 0.5.4

Conflicts:
	HISTORY.md
	project/Build.scala
	scalaz-7.0/src/main/scala/japgolly/scalajs/react/ScalazReact.scala
	scalaz-7.1/src/main/scala/japgolly/scalajs/react/ScalazReact.scala