Switch to named params via "options" hash vs indexed args for pagination etc

This has bitten me, and I wrote it. :) We should have the options to methods like retrieve_feed_touts be expressed as a named hash vs positional arguments. It's more expressive and rails-like in my opinion. Since there are sensible defaults in place, this really is optional configuration. Making this change would require breaking backwards compatibility so versioning would be key. SemVer?
