Fixed the bug introduced by latest bugfix. m(

We included ?/& in the search, but forgot to set the pos +1 char to
the right.

src/http.cpp

@@ -113,7 +113,7 @@ const string http::get_parameter(const string &request, const string &parameter)
     }
     if (pos != std::string::npos)
     {
-        pos += (1 + parameter.length());
+        pos += (2 + parameter.length());
         return request.substr(pos, request.find('&', pos));
     }