Minimal wrapper around Rust NIFs for fast RSS and Atom feed parsing
Heavily based on the existing FastRSS wrapper.
iex(1)> {:ok, map_of_atom} = FastSyndication.parse_atom("...atom_feed_string...")
iex(2)> {:ok, map_of_rss} = FastSyndication.parse_rss("...rss_feed_string...")
iex(2)> {:ok, %Feed{...}} = FastSyndication.parse("...rss_or_atom_feed_string...")