Improve terminology

[MaxGfeller]

It has been pointed out to me that the terminology of certain features of this library is not optimal, especially when you learned about typical MVP patterns somewhere.

Things like instance and controller mean different things there.

My proposal would be the following:

• resource stays the same
• instance gets renamed to pager
• We'll get rid of controller altogether, this can be just resource (it would reflect the relationship to resource better anyway)

Here's an example of how the resource would look like:

import { createResource, resource } from 'vuex-pagination'

let resource = createResource('books', fetchBooksPage)
// returns the same as this:
let resource = resource('books')

Let me know what you think!

[jonleesmith]

In my use I have mapped it to the name resource also so I definitely agree

[MaxGfeller]

@jonleesmith Thanks for the feedback! What do you think about the instance/pager?

[MaxGfeller]

controller has been renamed to resource in 1.3.0 but controller will continue to work while we're on the v1.x. In a next minor version, the use of controller will throw a deprecated warning.