eliom: add return type information for services in the eliom_output.mli
eliom: add return type information for services in the eliom_output.mli

Ignore-this: af3bd3851441fc8cc1663342f17e6d2c

darcs-hash:20110114150211-0cb73-34365f31c8f4406d37fe109c4c452723d88a4c84

mfp/ocsigenserver,mfp/ocsigenserver