make_query_string now allows \n in query
install .cmi and .cmx files of lwt lib
Rdf_4s_lwt now used and is harmonized with Rdf_sparql_http_lwt
[Changed] msg_param_name parameter of post query into Rdf_sparql_http by query_var
[Added] text/plain recognition as an Ok result without return value. (4store need)
Merge pull request #6 from ArnaudParant/4store

Rdf_4s_lwt now used and is harmonized with Rdf_sparql_http_lwt
prefix Ok constructor