Add a way to set the Apollo wrapper's displayName

[SachaG]

In my codebase, I have a scenario where I'm wrapping a form with three Apollo higher-order components: one to load the data shown in the form, one to add an edit mutation, and one to add a remove mutation.

This means that when using the React inspector, I end up with something that looks like:

<Apollo(Apollo(Apollo(withLoader(Form))))>

My suggestion would be to add an alias option to the graphql function's config argument so that you're able to get something like:

<withPost(withEdit(withRemove(withLoader(Form))))>

Here's where the change would take place:

https://github.com/SachaG/react-apollo/blob/master/src/graphql.tsx#L147