Updated README to mention correct plugin path.

Reclaim needs to be put under wp-content/plugins/reclaim. Checking it out as .../plugins/reclaim-social-media will break things like Facebook auth. Might warrant a separate ticket, but for now I think it's wise to standardize on a certain plugin name and "reclaim" seems to make sense.

UPDATE: Also fixed facebook-mod's default locale to 'en' for the time being. Working on a proper fix (see ticket discussion) later tonight.

UPDATE 2: Enabled importing the entire facebook timeline. Similar to twitter, this stores the last-check timestamp and only fetches new content since that timestamp, unless it's a forced resync.