Update simpleexample.cljs

Fixes `has no method 'mountComponentIntoNode'` error
update to react 11.1
Merge branch 'patch-1' of github.com:gknapp/reagent into devel
Fix 'unreachable code' warnings in latest clojurescript
Merge branch 'fix-warnings' of github.com:Skinney/reagent into devel
Version 0.4.3
update url to point to correct repo
update project namespace to reagent-project
update url to point to org repository
use reagent-core instead of reagent.core
update url as well
Merge pull request #1 from Whoops/master

Bring up-to-date with whoops/reagent