pass context to _call_psgi_callback()
split ngx_http_psgi_process_response

ngx_http_psgi_process_array_response is to be used for processing both
psgi and 'responder' output
fixed typo
added Dancer basic tests
added Mojolicious basic tests
added IO::Handle-like body tests
handle exceptions in IO::Handle->getline()
IO::Handle-like objects as PSGI response body
$/ for IO::Handles, corrected exception handling