Introduce endpoint name

[mingard]

Endpoints can have any route, meaning referring to them by a key as we require in Publish (dadi/publish#497) is not possible.

A temporary solution is to presume that the second param is the name of the endpoint:

/1.0/foo`

But in some cases they can contain more params:

1.0/database/foo/far

As the path can be anything, and the search feature in publish requires the name of the endpoint in order to run a lookup to see if it exists, we need a key/name.

module.exports.model = {
  settings: {
    name: "foo",
    displayName: "Foo Bar",
    cache: true,
    authenticate: false
  }
}

[jimlambie]

Adding a name is already possible with displayName. I will add name, deriving it from the endpoint filename: {endpointName}.js