Merge pull request #1 from mopemope/master

update to head
fix dead loop in app_handler

In app_handler, if response gets EAGAIN or STATUS_SUSPEND, PICOEV_WRITE event will be sent to main loop, but switch to hub code missing.... thus a dead looping cost 100% CPU on sendfile operations.
forget Py_XDECREF(res);
Fix crash when meeting null headers

(more to discover)
Merge pull request #37 from V-E-O/master

fix dead loop in app_handler