test: minor fixes (patch from https://github.com/everiq/ocaml-stomp/commit/18980c01f66bae677f189066dc344b7dfdda7b93)
enabled warnings, cleaned code
OMakefile: add rules for install/remove (patch from https://github.com/everiq/ocaml-stomp/commit/f3cad1fa0096743aeb5c293fdc53f487f13770d1); don't install test*.cmi; install stomp.a
message-oriented interface: separated stomp logic from actual I/O
prepared library for use with lwt_comm for interprocess communication