Rename to .cc, fix Makefile bugs, add example_clock

sse.h

@@ -0,0 +1,13 @@
+#pragma once
+
+#include "fastcgi.h"
+#include "sse_stream.h"
+
+class SSEServer {
+  public:
+	SSEServer(int port, const std::function<void(std::unique_ptr<SSEStream>)>& callback);
+	void Serve();
+
+  private:
+  	FastCGIServer fastcgi_server_;
+};