add redux-devtools integration

[sidorares]

https://github.com/gaearon/redux-devtools https://github.com/zalmoxisus/redux-devtools-extension

( implement window.devToolsExtension ? Does not look like it's standard / automatic hook ) Better option: use window.__REACT_DEVTOOLS_GLOBAL_HOOK__.devtoolsAgent from react-devtools integration and get access to top level context / redux store. Might be possible to do this without requiring redux app to support devtools explicitly

maybe .redux undo / .redux redo commands to navigate history ? show / trigger actions? show / inspect state?