update js_of_ocaml to 2.5
update tyxml to version 3.3.0
add version number to the name of the js_of_ocaml package
Updgrade ocsigen-server to 2.5
Update eliom to 4.1.0
Make uutf a *propagated*BuildInput of ocamlPackages.tyxml
Build js_of_ocaml with tyxml support
Adapt the derivation for the update of eliom to 4.1
Use opam to actually install eliom
Use propagatedBuildInputs in eliom
Merge pull request #4517 from FlorentBecker/eliom

ocsigen 2014-10