Pagination and calls in batches to suppress limits

[jmaspons]

Deal with pagination:

• osm_get_points_gps(bbox, page_number = 0, format = c("R", "gpx")) Allow to fetch gps points from all & more than one page (osm_get_points_gps()) #29
• osm_query_changesets((bbox, user, time, time_2, open, closed, changeset_ids, order = c("newest", "oldest"), limit = 100, format = c("R", "xml", "json"), tags_in_columns = FALSE)) Query changesets with more than 100 results #23
• osm_search_notes <- function(q, user, bbox, from, to, closed = 7, sort = c("updated_at", "created_at"), order = c("newest", "oldest"), limit = 100, format = c("R", "xml", "rss", "json", "gpx"))