User's of Gluestick may need to add custom redux middleware. This provides them with a way to do so. This also provides auto-upgrade support for this feature.

A precursor to this request is: TrueCar/gluestick-shared#1

createStore takes in a customMiddleware param which is added after the promiseMiddleware and thunk. Some middleware, like redux-logger, has to be the last middleware added thus customMiddleware is added after.

This is a precursor to: TrueCar/gluestick#40

Sometimes we mistype commands but Gluestick was just silently doing nothing. Users should be informed that they attempted to perform an unknown command and then shown the help to provide them with known commands.

I went to create a container, accidentally did gluestick generate component something and realized it would be nice to have a destroy method like Rails. I more or less copied what is in src/commands/generate.js but modified it as needed.

Something to consider:
Steps 1 - 4 in destroy and generate are the same aside from the messages they log. Does that warrant possible extraction?