When HMR update fails, it forces a page reload.

This may be desirable for consistency, but most of the time this is caused by a simple syntax error, and I'd like to error to just appear in console. When I fix the error, another HMR update will come and "fix" the system anyway.

When react-hot-loader used a pitch loader, it just put HMR-updated require inside a try-catch.

Now that I refactored it to be a simple loader (no pitching), I no longer have the ability to catch syntax errors in the breaking module.

Can we have a way to disable page reloads altogether? I guess making it opt-in and logging something like "The system is in inconsistent state" is fine with me.

cc @syranide