Many bug fixes, function improvements, and new functions since last release!

Numerous minor bug fixes, function improvements, and several new functions:

• array_slice
• protocol_of_uri, hostname_of_uri, path_of_uri, is_http_uri, sld_of_uri, relative_uri_hash
• dt_to_time, dt_to_date, dt_to_ordinal_date
• tw_url_to_username
• fb_url_to_event_id
• auto_space
• trim_leading_urls
• ucfirst (JS-only — exists in PHP itself)