spec to show loading issue when using kaminari pagination
no need to re-page already paged query results
load returns an array, which is not paginatable further
Revert "load returns an array, which is not paginatable further"

This reverts commit 79777986a850e2a63d8b021a552ef15eb361c33c.
replace use of Kaminari's PaginatableArray with our PaginatedArray
Merge pull request #31 from musicglue/kaminari

Use of ```#load``` with Kaminari pagination breaks on pages >= 2