Cleaner examples

- Use ${CXX} instead of explicit clang in the Makefile.
- More explanations.
- Use socat's fork option instead of a bash loop.
- Adds a run_* script for each example.
- Remove the useless "sleep" option in service2.

service.cpp

@@ -1,41 +0,0 @@
-#include <iostream>
-#include <string>
-#include <sstream>
-#include <fstream>
-#include <algorithm>
-#include <thread>
-
-std::string strip(std::string s)
-{
-    s.erase(std::find_if( s.rbegin(), s.rend(),
-                [](int ch) { return !std::isspace(ch); }
-            ).base(), s.end());
-    return s;
-}
-
-int main(int argc, char** argv)
-{
-    std::clog << "Start server" << std::endl;
-
-    while(true) {
-
-        // Blocking call on named pipes.
-        std::ifstream ifs(argv[1]);
-        std::stringstream datas;
-        datas << ifs.rdbuf();
-        ifs.close();
-
-        std::string data = strip(datas.str());
-
-        std::ofstream ofs(argv[2]);
-        std::clog << "Received: <" << data << ">" << std::endl;
-        ofs << data << std::endl;
-        ofs.close();
-
-        if(data == "exit") {
-            break;
-        }
-    }
-
-    std::clog << "Stop server" << std::endl;
-}