Fix cursor behavior for soft new lines
Fix cursor behavior for soft new lines

Summary:Forcing a selection will cause the browser to behave properly and show the cursor for multiple new lines.
Closes https://github.com/facebook/draft-js/pull/255

Reviewed By: spicyj

Differential Revision: D3132587

fb-gh-sync-id: 93d94cfae96e7233b573623cd8076fa212a87182
fbshipit-source-id: 93d94cfae96e7233b573623cd8076fa212a87182

dirkholsopple/draft-js,SciMts/draft-js,tonygentilcore/draft-js,SciMts/draft-js,brookslyrette/draft-js,TripleDip/draft-js,johnmpotter/draft-js,facebook/draft-js,davidchang/draft-js,davidchang/draft-js,johnmpotter/draft-js,dirkholsopple/draft-js,brookslyrette/draft-js,TripleDip/draft-js,tonygentilcore/draft-js