spdycat: Don't include port in host header field if port == 443.

Added accept header field.
Use SPDYLAY_VERSION in user-agent header field.

Some sites do not like 443 is in host header field.

examples/spdycat.cc

@@ -180,7 +180,9 @@ int communicate(const std::string& host, uint16_t port,
   if(reqvec[0].us.ipv6LiteralAddress) {
     ss << "]";
   }
-  ss << ":" << port;
+  if(port != 443) {
+    ss << ":" << port;
+  }
   std::string hostport = ss.str();
 
   for(int i = 0, n = reqvec.size(); i < n; ++i) {

examples/spdylay_ssl.cc

@@ -116,7 +116,8 @@ int Spdylay::submit_request(const std::string& hostport,
     ":version", "HTTP/1.1",
     ":scheme", "https",
     ":host", hostport.c_str(),
-    "user-agent", "spdylay/0.0.0",
+    "accept", "*/*",
+    "user-agent", "spdylay/"SPDYLAY_VERSION,
     NULL
   };
   return spdylay_submit_request(session_, pri, nv, NULL, stream_user_data);