Use React-provided stacktrace in crash overlay

Created by: Timer

The recently merged crash overlay should support whitelisted warnings thrown by React.

Currently, this can be accomplished by enabling the console proxy via:

proxyConsole('error');

However, this relies on a synthetically generated stack-trace and not the stack-trace provided by React in the warning. e.g.

    var error = void 0;
    try {
      throw new Error(message);
    } catch (e) {
      error = e;
    }

This is problematic, however, because of how React works.

In React, components aren't rendered recursively, so there's never more than one component's render() on the stack - @gaearon

This results in an unreconstructed tree of components specifying where the problem is stemming from.

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The stack-trace from React is actually already parsed, and used to replace the line references on the synthetically generated stack-trace.

The proper behavior, however, would be to not generate a synthetic stack-trace and rely solely on the stack-trace given by React.

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