In rare circumstances, Simulation.run targets can go out of date. Targets are now stored by-name.
Added Sel.findFirstIn
ReactTestUtils now accept plain old ReactElements.
Styles now given to React in camel case. No more warnings.

Fixes #47
HISTORY.md: Tweak
Releasing 0.6.1
Version bump
Merge branch 'master' into v0.7.x

Conflicts:
	HISTORY.md
	project/Build.scala
Removed {ref,Key}Attr aliases from prefixed