3400: ArvadosResourceList returns all items (paging as necessary) unless limit() is specified.
* ArvadosResourceList#each returns results incrementally. ArvadosResourceList#all (or ArvadosResourceList#results) prefetches the entire list.
* Added tests. Fixed tests.
* Removed hardcoded limit() in cases where it was apparent that it was being used as a workaround for the paging problem.
* Removed obsolete name_link code (including CollectionsController#choose override) that was causing tests to fail.