Bugfix for HTTP 1.0 streaming

Wrong branch of mochicow_request:respond called, resulting in bad match exception, as everything related to streaming contains in Body, which supposed to be an io_list in that branch.
It does work with 1.0, as TransferEncoding is still 'identity'.
Merge pull request #310 from tempaccounterl/patch-1

Bugfix for HTTP 1.0 streaming