Added Gnt.Gnttap.{map_exn, mapv_exn} functions.
Merge pull request #25 from djs55/master

Fix the fix to the unknown 'unknown' shutdown_reasons
Merge pull request #24 from vbmithr/master

Added Gnt.Gnttap.{map_exn, mapv_exn} functions.
Added a binding to xc_evtchn_close, plus some cleaning in the evtchn bindings.
Merge pull request #26 from vbmithr/master

xc_evtchn_close