Don't ignore records for all modules starting with "raven"

Currently raven's logging handler ignores any errors coming from modules beginning with "raven", even though the module may not actually belong to raven and may be called something like "raven_utils". This change alters the logic to check for either an exact match on "raven", or a path starting with "raven." (including the namespace separator). This should cover both cases and allow for logging of errors from "raven_utils" but not from any module belonging to raven itself.