get_remote_repositories is now designed to support pagination, making

use of the new paginator classes. When calling get_remote_repositories,

the caller will get back an APIPaginator subclass that can be used to

paginate through all results.
The function also now takes a starting page for the pagination, and a

requested number of results per page.
This will make it easier to write web API that interfaces with

get_remote_repositories, allowing pagination to occur as expected by

callers.
Right now, only GitHub supports this function, so it's the only one that

is affected.

Unit tests passed.
Tested this by hand in the shell. Paginated back and forth between results.