add a little hack to chunked/chunked_iter to make it work nicely with strings
add a little hack to chunked/chunked_iter to make it work nicely with strings

kevinastone/boltons,suranap/boltons,zeroSteiner/boltons,doublereedkurt/boltons,markrwilliams/boltons,siemens/boltons,neuropil/boltons,mgaitan/boltons