mod_oembed: fixes for provider list.
Added oembed_client:providers/2 call for debugging.
Added lager logging.
core: added extra arg to m_media:replace/insert for m_rsc_update options.
mod_import_csv: connected reset checkbox, now also forces re-import of items.
Added support for 'medium_url' column name, downloads and imports an url for a medium item.
Added lager logging.
Added filtering of escaped quotes.