React 15.4 breaks hot-reloading

[doug-wade]

From my attempts to start the Hello World example:

ERROR in /Users/dwade/foss/react-server/~/react-dom/lib/ReactDebugTool.js
Module not found: Error: Cannot resolve 'file' or 'directory' /Users/dwade/foss/react-server/packages/react-server-examples/hello-world/node_modules/react/lib/ReactComponentTreeHook in /Users/dwade/foss/react-server/node_modules/react-dom/lib
 @ /Users/dwade/foss/react-server/~/react-dom/lib/ReactDebugTool.js 16:29-72

ERROR in /Users/dwade/foss/react-server/~/react-dom/lib/checkReactTypeSpec.js
Module not found: Error: Cannot resolve 'file' or 'directory' /Users/dwade/foss/react-server/packages/react-server-examples/hello-world/node_modules/react/lib/ReactComponentTreeHook in /Users/dwade/foss/react-server/node_modules/react-dom/lib
 @ /Users/dwade/foss/react-server/~/react-dom/lib/checkReactTypeSpec.js 29:27-70 71:37-80

looks like its an outdated version of react-hot-loader

not sure why my initial testing of #780 didn't catch this 😞 but I don't think its worth reverting, since the real problem is that react 15 doesn't play nice with react-server