Please consider running tryFlow code in web worker

Hi,

I often encounter https://flowtype.org/try/ locking out my browser in Firefox that often causes "slow script" prompts to show up, on Safari it just makes browser unusable. I presume that could be fixed by running a flow tryFlow code in the web-worker, so just post typed code to the webworker and perform all the type checking there.

That would greatly improve usability of the tool, where often times I need to wait couple of minutes to just delete all the code and write something else.