Alternative sorting support
Flock now supports 'hot' and 'top' sorting.
'hot' sorting algorithm taken from reddit github: https://github.com/reddit/reddit/blob/4111c7338a7c9cb1fd21a0fe3a94a7c608f73a9b/r2/r2/lib/db/_sorts.pyx#L23
Added url query parsing for 'sort' keyword.
Added simple "toggle all" checkbox to frontpage
Flock now pulls all links from this week down, and can be browsed and sorted with new querystring options.
Added rate limit function for easier Reddit API rate limiting.

closes #11