Remove extraneous return in PageStore dispatcher callback.

The dispatcher released by facebook (and included in this starter kit)
doesn't use the return value of the stores' dispatcher callbacks.
Merge pull request #48 from zgotsch/master

Remove extraneous return in PageStore dispatcher callback.
improve url compatibility
js url
Merge pull request #50 from zhiyelee/master

Replace relative URLs to absolute in index.html
Add data files to be used in Web API / Async Rendering sample